Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9537e6b5832f57…

MALICIOUS

PDF

55.3 KB Created: 2021-09-07 12:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b22e7503305e5c115ec3a3d8afa1d799 SHA-1: 8b7bb81400e536753c87e11377d6539214683b19 SHA-256: 1b9537e6b5832f5726d181b9b6d6cff4d7897c5ba7063ac0a132db1103c50b31
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious files. ClamAV detected the file as a phishing trojan, and ML classifiers also flagged it as malicious. The presence of numerous external URIs, many pointing to compromised CMS upload directories, indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7374

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d707ed765---78885475900.pdf In PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc6dc3035faae7dbb49947e91cfdb12b/17148666533.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/sazerolobeloka.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/30354802124.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/49072737836.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a11ce649b---5650510184.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/zavawomamokamobumubifux.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/zebevaku.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/853a9503f5b00541e3c58bedc65bb8e9/61799437406.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/94807776089.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/xomavixedibipizoxu.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/tuvip.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/051cdbf18009c55b68293f515018032f/31662941991.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lodelejojiwi.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/49814667846.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/56976581979.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=encyclopedia+of+bodybuilding+robert+kennedy+pdf+freePDF link annotation

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