Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f147315aa78e1a…

MALICIOUS

PDF

60.8 KB Created: 2021-06-21 02:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1f1c4dd6ec68620145bdc5a3ad6caa46 SHA-1: 36f6ab1dabb52be9f343f33e9487811df919ed30 SHA-256: a4f147315aa78e1afbf8c91efca8e63f73044fc4f6d45dd0d6f570a528ead594
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, but the PDF structure itself facilitates the attack by acting as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6845

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://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/sbe3807r2dnbca9cm9k6sn5ch4/92996071976.pdf In PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b28dcea0---sugobamunexivemoruta.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/27175819282.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/kdn2r2e5cqiptbg58r6g0nqq8r/nonagaraludivemarisiku.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/1d8lk7lj7uvsjk6sm4opjt0a16/suvujukabamitasimexipu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/36dfdb39aecb05dd072d86f797eac4e3/52537243954.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087a5f88e510---vorosub.pdfIn PDF document text
    • http://billsky.ee/files/file/rufupini.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/1c6c6a721e7d7fa8c8fb4d348e35ff5f/54180274101.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/l4oudbsi1tcqrk88p3m73kdn13/zubaronamaxameliwoperuk.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160703a6782a30---77128287056.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/47598cc8c8c4c6e59cc3896c161fe431/bamuxogutorug.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/95726474549.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/disiwi.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/lifakujaz.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a24fe8036dab3799be44e32a4374d84a/97926541288.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/k3n3rbvgb3h6rme6bnrihpbtf1/lirelajikevobelineli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=no+fear+shakespeare+sonnetsPDF link annotation

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