Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c35658e705fa259…

MALICIOUS

PDF

54.8 KB Created: 2021-07-30 17:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b5e1b4cbf21956d0cb7b5a4bf03d4fb0 SHA-1: a4de1ec004f9a7d45254f3e18f0cd4c5946d30a3 SHA-256: 9c35658e705fa25975f2508197a8abd8287f173c37d1b805ddd639716653276a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress sites and use 'utm_term' parameters suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier indicate malicious intent, likely to trick users into downloading malware or engaging in phishing activities. No scripts were extracted, but the presence of numerous suspicious URLs points to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5138

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. 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://allytemp.ru/uplcv?utm_term=sony+vegas+pro+13+free+download+mega+portable PDF link annotation
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e36ae6e9a4a---97185560642.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/fb857a2c057376b77a3a1ee01e727536/51744046872.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160904608a72ee---32463762808.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/73555448400.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/towedumirug.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/wobijivaki.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/fozusinujutasekadejoz.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7ce1f91a59ac635bda6435eb6af2ca9d/jobubamar.pdfIn PDF document text

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