Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3413024e359713a…

MALICIOUS

PDF

37.2 KB Created: 2021-06-20 11:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8e941c2b498112707d0b16e5c3910112 SHA-1: b7814f8bce838b00038f1f9c1a9e380d51f6d990 SHA-256: b3413024e359713a3d309421af3f941277e68c5451c292ee6d4cbf9aa3c9daae
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as a phishing lure due to its image-only nature and small file size, typical of a screenshot designed to hide a clickable element. Heuristics indicate that the document links to compromised WordPress upload directories, suggesting it's part of a chain designed to deliver a payload. ClamAV detection confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8984

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 37 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/34efd05842a7140c7de2513b020e60ae/sekoz.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fue8b2c8u35l3d343lct51kh5b/36723682643.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/571822f114a3dfedef61786eb6d6043f/84189220171.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/c62259bf3ab69e13f1f1db2e9e9fef9f/90841522804.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/5a8b30d3e445b08a4c6In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=make+pdf+combinePDF link annotation

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