Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7ceb9be2ecf8dc…

MALICIOUS

PDF

48.0 KB Created: 2021-09-04 14:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5f0fd952b11b3624b8a6a5c88d200c73 SHA-1: 6ff72eccffdb52af98e54e1bee9484c07766fc4c SHA-256: ef7ceb9be2ecf8dc72a35fa3711ec6bbb8c79a467626123de126d359cf402ed5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the overall structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8568

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0837eed6c3---32808205144.pdf In PDF document text
    • https://guineaservicesproviders.com/gsp/files/miwuxajoridegunolejikulo.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/jofibemep.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/33892312223.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f4802af4e---rojejusorimemuwovixutuvo.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/9286297486.pdfIn PDF document text
    • http://sy-smile.com/upload/files/rulukuwudu.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/nasubidulepil.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/t4epji62vdknag0tvq6f8r6i40/42659372153.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/22944176750.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0546ca221---lozimamov.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/80384fde319e3eb6b98cfcb4c07a6b97/12711359047.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69d81526a---xesizupisutap.pdfIn PDF document text
    • https://actor-conseil.com/files/file/96886586422.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45cffe95af---59583926316.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/bovanotuk.pdfIn PDF document text
    • http://strap.sk/uploads/files/52263729179.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/6cf593516f2d137667b4b48d9f1a696b/47799973176.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/7d893b9bcb3c1b62095b263725dd4a8a/75061816761.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/xijezik.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/guvililekosevitojadibir.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec52a9595b---lupiderewoberi.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/53018534730.pdfIn PDF document text
    • http://svx.su/ffile/file/82556622081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=dorian+astor+nietzsche+pdfPDF link annotation

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