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CybersecurityAI-assisted

Fake Dropbox Phishing Campaign Targets Users, Steals Login Credentials

## Cybersecurity: Phishing Campaign Analysis

JBy Jonathan PierceFeb 04, 20261 min read

Cybersecurity: Phishing Campaign Analysis

A sophisticated phishing campaign has been identified, utilizing a multi-stage approach to bypass email filtering and content-scanning systems. This attack employs trusted platforms, benign file formats, and layered redirection techniques to harvest user credentials effectively.

The phishing campaign initiates with a professionally crafted email containing a PDF attachment. Utilizing cloud infrastructure, specifically Vercel Blob storage, the PDF redirects victims to a counterfeit Dropbox login page designed to capture credentials.

The emails, themed around procurement, appear routine and legitimate, requesting recipients to sign in with business email credentials. Notably, the email body lacks malicious links, relying on the PDF attachment as the primary delivery mechanism, effectively bypassing standard email authentication checks like SPF, DKIM, and DMARC.

Analysis of the malicious PDF reveals the use of FlateDecode-compressed streams and AcroForm objects, which are commonly exploited to embed interactive clickable elements. This approach makes the PDF appear benign to security scanning tools.

The PDF includes an innocuous link labeled “View specification online Here:” directing victims to a cloud-hosted URL. This trusted infrastructure is leveraged to bypass automated security checks, with subsequent redirection to a fraudulent Dropbox login page.

Upon credential submission, malicious JavaScript collects user credentials along with system and location information, transmitting the data to an attacker-controlled Telegram bot. The script then displays a simulated login failure message, encouraging victims to retry login.

Harvested credentials are sent to attacker infrastructure via Telegram, facilitating account takeover and potential fraud. This multi-stage approach is successful due to the appearance of legitimacy created by using trusted PDF formats, legitimate cloud storage, and familiar branding.

A sophisticated phishing campaign has been identified, utilizing a multi-stage approach to bypass email filtering and content-scanning systems.
Jonathan Pierce · Thehackingpost

Organizations are advised to implement email filtering for PDF attachments from untrusted sources, enforce multi-factor authentication, and conduct security awareness training emphasizing verification of login prompts and sender authenticity.

Subject e-Tender (Operating Unit – Standard P.O requires your acceptance)

Lure PDF Attachment Name: 2026_PO_I0I_Jan_25_LGXZ.pdf

Sha1: 56ba0c54f9f02c182a46461dc448868fc663901c

Secondary PDF Name: ProductLists.pdf

Advertisement

Sha1: 88e542b163d1de6dedbbc85b1035a2b2d3b88bb8

Dropper hxxps://nte2srryro7jecki.public.blob.vercel-storage.com/ProductLists.pdf

Redirected URL hxxps://tovz.life/bid-doc2026.php/?ai=xd

C2 hxxps://api.telegram.org/bot6141034733:AAH-FLm9XyFjiV6F7jq6UHBXcVZTq7rZbP0/sendMessage

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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