Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dee647a4660365c…

MALICIOUS

PDF

71.8 KB Created: 2021-06-17 20:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 25654b6109b8298c684b7c006a045e2a SHA-1: 6f3574f0b1d8c0a2b17d8e9fe090469c4cf9565d SHA-256: 9dee647a4660365cb06e5bd7d0fd9b9da11f70009eed25dfc2f2239d59c4cfda
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6585

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 http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16092128b5b9d4---gamatinugokovepalukibewo.pdf In PDF document text
    • https://bursac.net/userfiles/file/16096911583.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f094d4af---zemobevorefunet.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/1796771131.pdfIn PDF document text
    • https://silga.ca/userfiles/file/50147278373.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/b79a71a4ea7bed7e8d839090bdd7c19d/kekepap.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160794b2b92940---nepikegobugake.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/925cc94f64500d36570fc07431b714eb/wonipan.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/76667284372.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/m7c5pkvomgfta0oemhof57bddh/maxixawelidupes.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b65a78a7---75323162649.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/27913211356.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/db1085b17959c21515e30887ca41b033/totumifebobilatigoxizado.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16098eaa32f1a9---62985074592.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/e9bu676k7v34v84fff52qdfg4q/rukujilomaz.pdfIn PDF document text
    • http://tipiland.net/upload/file/66434332016.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/20906100026.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/ee815c3c4a175a0bf213fcadfe3ed8aa/5133501300.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/koniluwupakipiwavojowol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fuzzy+c+means+clustering+algorithmPDF link annotation

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