Malicious PDF — malware analysis report

Static analysis result for SHA-256 1647c5a07bae6fd0…

MALICIOUS

PDF

52.6 KB Created: 2021-09-03 22:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34fd6f1298a40ef49cd34a7a35c01691 SHA-1: 62cdb2d4586adf644dc928426de3d33270e6af9b SHA-256: 1647c5a07bae6fd05a4bc381e65d19b98f756b116b07eb79b94dfa0345a8d211
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to host or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of phishing or malware delivery campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7858

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://virtrade.gr/userfiles_lybo/file/27138850437.pdf In PDF document text
    • http://aliceinformaticasrl.com/user/pages/8101560326.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608135535bb88---jabomap.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/71415322576.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67ac89e43---pugoviverukitovidunurud.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7afc156f8---fegapamasapezuverijudo.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/9c97860103b540999242e7e496c661cb/16115186510.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/74290370084.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/bolezajekuzukuben.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/46440116082.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/narofefekemavivufaxifow.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcd926f92---rolinox.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/buwoterajitudumif.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff5576aa96---73050126802.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/12622076629.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/maderivigivafozelamol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=advanced+vocabulary+synonyms+pdfPDF link annotation

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