Malicious PDF — malware analysis report

Static analysis result for SHA-256 69316c25f578e0d7…

MALICIOUS

PDF

59.9 KB Created: 2021-05-19 13:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19eecf3ba55cc6b8ec92bbd9bc3e5271 SHA-1: 5d8f230075cff34742b65c634b54c695c186f1cb SHA-256: 69316c25f578e0d78a37aecae17be15f7ca0b351c5df5fd4b713110e80b0deb7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users to malicious content or phishing pages. The presence of numerous links on potentially compromised infrastructure suggests an attempt to distribute malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7927

Heuristics 5

  • 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
  • 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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092ff7f492bc---rogifetalonuworazomisito.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/26958388722.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608385f3bb7d5---mijofotetovonawurukumugi.pdf
    • http://www.jindatunnel.com/up_files/file/41628658250.pdf
    • http://www.findvoters.com/userfiles/file/famike.pdf
    • http://altaprecision.com/userfiles/file/zasofarosedamud.pdf
    • https://aduanaldelvalle.com/userfiles/file/99650420226.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1e86199e---6459022365.pdf
    • https://avela.md/userfiles/file/zifuxeper.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/h10rt919rvcr49rk226j332l85/70217315978.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/53e78a4cb596491b6a7a978829a7593b/xikajalabufe.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c23d8f44ea14defd10f80cb5098709c9/99358999129.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/d8476c35126c5ddbe9e722cfe742866d/lumuritesamuzuxamomixuw.pdf
    • https://muratay.nl/userfiles/file/31966189322.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=bissell+proheat+pet+troubleshooting+manual
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49a.bin
6c3757aaa95d7a9782576197d0a2bd110ae276859971518bfb6211c41b6d3373		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 5420 bytes

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