Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bfe64316211c58…

MALICIOUS

PDF

65.0 KB Created: 2021-06-20 06:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 17c32094d1f8c8543b44d50332c79605 SHA-1: b73152e5d066f6a76146997606ebc11c7b8d3d55 SHA-256: 66bfe64316211c58276a9405c88c80631c8df5e4b9fd01442302757183aba1dc
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains numerous embedded links, many pointing to compromised WordPress installations and disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to wkhtmltopdf and PDF metadata, indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8982

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/sgn0f7cmu3kv4f94sn50v6qpit/31312104347.pdf In PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16218049582785.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087081579056---61246616002.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/sn7qvostsq8dpv4k4mjeuc30d1/rumelunevitaridozezi.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/31384965186.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/sutetujifo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160989ee2b0672---8247130777.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/bb0fd4d6b73cf0a67ba247e3a281b8e8/bufugajezurixofuxa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816fe6e7515---28263076919.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/47323109487.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/44573106865.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/e60360653750f22d8d98b2662b8a3811/bumuxirukodidoto.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/e59f8467653b91335636f59c624c1a37/duzimef.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/solimevizosuri.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dc1f4477b---29468123029.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad439e9c47---37476948502.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/s7cpkumokn7qu5q30ql1mfmig7/bapigopukigivoloxigobobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=assetto+corsa+competizione+traction+control+settingsPDF link annotation

Related samples 8

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