Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d2eb23078926b8…

MALICIOUS

PDF

64.0 KB Created: 2021-06-10 14:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 55c27891f7d56fb002d11819320772e4 SHA-1: 358cc0a69b22d42f2c27303e81acc2d3474ffbdf SHA-256: b6d2eb23078926b8330bd8576185f66d38c48f0aacdef009c85bd6d00a0672f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, disguised as an answer key for a worksheet. The embedded URLs suggest an attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7442

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://huntic.ru/uplcv?utm_term=codominance+and+incomplete+dominance+worksheet+answer+key PDF link annotation
    • https://aslimitada.com/userfiles/file/32746173727.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/c23b17674698764cbb2ca15dccc93245/vilowipisazivib.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/46526833534.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/b20970e4d9ca17028d1638f57f2e1a8a/fepezazimamapokexureviw.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7ff46a4b7674760193ef1e1deabcddc9/lunufevorodobikolux.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767db55205b---xifebalekelub.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/16d85e85ffa7477d555049b3d9b3fb7f/10287516153.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f3e053e2b1ddcd2b1e54b6c8aba46a29/54699948556.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/653f8e6399f54e2eddb2c14a712c928b/99694160658.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/zefarawirubivuji.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b733351d701---83524972596.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16086f79c5d03b---57880532013.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d91d611fd7---paramilidoraferegiw.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/ea28241f2d2956f342aa97f2278384eb/83178240079.pdfIn PDF document text
    • https://afayl.com/userfiles/file/sepogojokusevovuper.pdfIn PDF document text

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