Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd277022cc65137…

MALICIOUS

PDF

75.3 KB Created: 2021-06-11 13:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c01f1b8449ed92104bc43a550ba9c4f6 SHA-1: 7607807bccc6ca3aa46608f663ed3bfc3990bbe9 SHA-256: bfd277022cc65137a26d57b64d74e0f7bd7e5d4cce0c1c66c307fb19314e5ce1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://wastran.ru/uplcv?utm_term=saxon+algebra+1+4th+edition+pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bdcf9ff98---94120633027.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608897c5ce6bb---22554063783.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2fa015f0d---xovawo.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a118b960af9---85241858537.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/78f802804d82017fd4700a03b011669d/58138402684.pdf
    • http://otvorene-srdce.sk/userfiles/file/68292186002.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/6h08dahueg68vao6838bugj4ud/gajodilidimulilapopopab.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7ede7c7d1ad8cec6dd70dc5737fe31ab/fujunurulefi.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/1cctk9m8lbfitmpfr9ivt6fa39/josukides.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u0vvevc334tg6cq6fb2gik0a33/2432064651.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ca1d0cfee---wamut.pdf
    • http://cortabellanews.com/userimages/monikitivuxuv.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3269ab9743---81932113911.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000e71c.bin
cb35bb452e233a9cda43f5a643593b7a073801811642b8fa22066da61e2e13d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 5576 bytes
font_01_sfnt_off0000fa12.bin
c6b3ace5a74cf9ae93819c98038ba983bce0b96751109464988cacb915dc8948		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 11392 bytes

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