Malicious PDF — malware analysis report

Static analysis result for SHA-256 787ae4ae0715bcf4…

MALICIOUS

PDF

59.4 KB Created: 2021-08-10 22:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61145dad0d642f5f5ebf1f5c10d933d2 SHA-1: a2062d1032891dc147c2a3059ee86e93e34cd9e1 SHA-256: 787ae4ae0715bcf46ab818f555d18062e189b7d278ddf5a7adda9dcf06439687
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' highlights links to compromised WordPress upload storage, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8263

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
  • 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://archism.ru/uplcv?utm_term=the+new+encyclopedia+of+modern+bodybuilding+review PDF link annotation
    • http://drivescuolaguida.it/userfiles/files/lariwib.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609be2f1b3c77---95883662106.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e613088251---89967356801.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/luzanizame.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ug5asejhsv28ntif9vs6k9g2r9/97284154348.pdfIn PDF document text
    • https://geniodelweb.com/file/setivorezusufo.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/75467167290.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/kalukiririzukekolako.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mnn4e76bpcmmmcq7c09rkim3c3/nenolijorutemisub.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/32983534110.pdfIn PDF document text

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