Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdcb5a3d8180c18…

MALICIOUS

PDF

62.3 KB Created: 2021-09-14 02:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90b8cd825faf8bc23ec1f6bfdbd820cf SHA-1: 864eada72504187b5d14384439e428c14ae010d7 SHA-256: ffdcb5a3d8180c181fc399b9ed4a4cbfdc8683263be6d68e7b39da609f65817a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6040

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://proreferee.ru/uploads/ckfinder/files/doloxepotewenavu.pdf In PDF document text
    • https://bandai-k.com/userfiles/file/zujexapudexafogajobupevig.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/68586427383.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7qu3hkemoibv09vpq89t6na9m3/45516853647.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/subebivipedok.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d90c72a3---64778599523.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/lozulagonek.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/pivazituzeketalov.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b5fb222693---runuwowove.pdfIn PDF document text
    • http://bulmarconsult.com/files/sopizokexurujizavukoxotiw.pdfIn PDF document text
    • https://camelcarpet.org/d/files/79280536589.pdfIn PDF document text
    • http://whatdwellswithin.com/file/sodozekurarelifugoxos.pdfIn PDF document text
    • http://chapelguild.com/images/usr/ruzebojowowuridanuvivora.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/74408662372.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/wozatadijujewaji.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/47314805276.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/77555308276.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/zamilowijij.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/nixifixixiwadilulowewixe.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5174a08b---mevopegepa.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/43085465961.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/83588149936.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/19646415531.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/32836472742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=123movies+free+guyPDF link annotation

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