Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdf0bc22239296d…

MALICIOUS

PDF

66.8 KB Created: 2021-06-25 05:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f92e1ebfafeb27dc5c41e477df2e3b0c SHA-1: 856f9b0978656105511c3eb988ecb95d0a374659 SHA-256: 6bdf0bc22239296d29e3d0efddda7173b0e85babe3cab2c0185c716a560a2016
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of numerous external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://almoheetmanpower.com/public_html/userfiles/file/silijelot.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609361b39b5e0---zexotasagupibarowufikev.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/mokulawakemiwilezusaguj.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/1180301399.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1245d6d24a3ce7bb0e76912fde2a1084/55997812165.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c83197eaf---sonin.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2ac6ffa154f7bfdba28bbdc9559afc9f/70319547420.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160909d6b93aa7---miwufetasasunede.pdf
    • http://cmtsport.com/pliki/kugepazo.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b32b779cd---zisarepogakenorigogejagu.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b320cf570e1---52833093326.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36195747ed---60503734546.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/31618e2bb3fa8df2d05e4ad067660f63/fexiganiserudolufa.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f4c6133ec---10757964462.pdf
    • https://ovth.ch/userfiles/files/sagonobumido.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=environmental+engineering+pdf+nptel
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c867.bin
684ee9bac0f9d709dd192e3b6b0bd99be14e0400c44416ee19d841a07433e154		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC867 5200 bytes
font_01_sfnt_off0000da0f.bin
cb770943387ab8f7a6813d5846e95086d21cf4e9fb791d9db0c43c1a72713c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 10504 bytes

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