Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8681ff78ba766f…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 08:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 244751045c7604568d3a23b77bc4ec2d SHA-1: 6fefad4b8de6f73bd80c3c2f77ad86f572a55f36 SHA-256: cb8681ff78ba766ffeb98c6fe9306f5b284b8ee25c1d79e59a83e9788bc853f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://accessiblevehicleservices.com/userfiles/file/zates.pdf In PDF document text
    • https://successstudio.net/userfiles/file/safaloti.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/kusupibexaxazovejili.pdfIn PDF document text
    • http://brenderup.ro/mm/file/28339644914.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/gukusukubaj.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/27423955559.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a93b5a10278fed8500b399c5f7f591d5/naretutopesijesoridu.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/45556196319.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613db539330eb---64500360240.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/zezibepukoboruwube.pdfIn PDF document text
    • https://senfina.top/uploads/files/20564886563.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/gexedugopowiselebatunewi.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/38237447404.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161319cc98500c---66061581469.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210909_CFA6CCCEFB3BD204.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/tebawagefelu.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16139e9e6cbeda---paxuramodakos.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vh90malc941giqe7n60id0cutt/91722353913.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/lozixever.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/701cf443aec2ccd7be5893a89d2f8a0e/vorazulelosedita.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/46662788956.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/fatinamakeli.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a25e881ba---79627950782.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/zosuliwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+video+player+for+android+10PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 17240 bytes
SHA-256: a61d954afc96fb4a419afa0d919f455688c5247da3c5c5b0076f9e5a5cfd8c09
font_01_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 10896 bytes
SHA-256: e88eaa6a0e5b8bfcc3ea460796505ab8a0ee60d6acdd4af2d7b9b7939693c090
font_02_sfnt_off000127fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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