Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d61e605efa700d…

MALICIOUS

PDF

66.2 KB Created: 2021-06-06 06:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d19fb57f88a826268a5160258a3e012 SHA-1: 67ec3ea9bc20875c0ff6c0b2bdd00a9b963ff0e4 SHA-256: c6d61e605efa700db86280bd1ff51dee96543a0fa26203d3ac6db19bcf12ac35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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://nomylo.ru/uplcv?utm_term=my+tribute+to+god+be+the+glory+pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609876c6a0643---14220798535.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/db137fcc3a21a3130bea1342ab1c76d9/febipe.pdf
    • http://clinivetmadonnadirosa.eu/userfiles/files/24702609600.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e4b9a2c9e---10804505855.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ml6kdsr3r94jo7n0fg4s3v7630/12439056163.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5mqsgi5j4svqjecsvcq1qjhj17/xefalodujisuxu.pdf
    • https://aplusadvance.com/naver_editor/data/file/gidofafixanelis.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/7c40ead0d0b52027952428b710583e3e/45966942963.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd4863bf55---ruzetoludeduti.pdf
    • https://wavemed.it/wp-content/plugins/super-forms/uploads/php/files/432e7ef68986d798634aa9cf2262abfd/89375350154.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ff82dd6c87c063f7806c43b5faf2a8e1/81007644218.pdf
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe7cbd8a11---bilibarize.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/867mavk4vf196bnhf0h2oegf13/kufejasumobeviwep.pdf
    • http://webursitet.org/Files/file/34137372608.pdf
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4e82aaf8debf796a7bf5dd92904b630d/zobiwuwijosizifuwopobus.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_off0000c6e7.bin
2be403b00da3d2aa89707e8139fac161b936e675145d6bb647406a18e0e16986		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 5160 bytes
font_01_sfnt_off0000d882.bin
6312db1e31a6eec2e7b7c9edbc22fde246534ea043e23456283bf8b68b54fe46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 10196 bytes

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