Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0beea8bd1c2be6…

MALICIOUS

PDF

73.6 KB Created: 2021-06-07 00:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb38ca3db79723769767d896b584767e SHA-1: de265df990a5d331c1c86439d9a3c9e6d9aff449 SHA-256: 6c0beea8bd1c2be6f573dd9ab79ff36cc3c0613108cf292e740666741de511c0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

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://infrive.ru/uplcv?utm_term=who+kills+duncan%2527s+guards+in+macbeth
    • http://designpavelzapletal.cz/files/file/xikizifogarewewe.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16077ce7a4f809---59984629110.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72943688091.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed04f7c64b---fezebelaxuwimu.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708b49f21ec---14369474715.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160743af2d6e11---nutiwuniwija.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7b3c729e07c29f22fcc83167bbff9c79/xigobufozufero.pdf
    • http://gorisum.net/fckeditor/upload_file/file/70718950570.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/rlhrhh3cr268keddgtu32l5c97/najitafetuj.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd09cb3193---10393514247.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746169256ef---gobironopilezivez.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/sabun.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/33173ed6f6e25f672ed7a63c9a4e7885/88652883318.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/safotapolapotutipematap.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/70079984030.pdf
    • http://instant-image.net/UserFiles/Site/File/firojetudozufu.pdf
    • http://shinies.ru/img/lib/file/82112787785.pdf
    • https://psfund.org/public/uploads/files/cms_files/medufa.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/05ff74fb82f3619c2428c22e53f19388/rupen.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_off0000e050.bin
4019d629648a7438e6080dd84f660b2a78c03fcb44f511815e0cf020404c6947		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 5604 bytes
font_01_sfnt_off0000f345.bin
254f3bddaa94505e543dfc0d772586f8ee5c30ef76bd8753151673f424e55da9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 11564 bytes

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