Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a187929778debc…

MALICIOUS

PDF

97.3 KB Created: 2021-06-10 14:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 59338fa138a50fd2117e29c52a7b8117 SHA-1: ac8db5a661260c78583e3d534af0ed244ace1186 SHA-256: 06a187929778debc8b30223762f8ec94d43bd8b323cb60371ed78c0c1cdfbfa4
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://laborke.ru/uplcv?utm_term=ib+history+ia+sample PDF link annotation
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/09d85e35ce35c560ded463f39426a8a3/tilijupisukinebo.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17a842cb2---vovawevudiwube.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/7c52503bf8748995f0d2c449d5a5404e/93591264102.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7796aeb801dd963da05fe26125e76cef/gewurirufopowizope.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/516a79265f1d7574f6a37ce6630b83ce/vizonafijelofarojasat.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/vurajodaborikodumapin.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ako6kqkocucbiil9c8a3evpodd/vuviragujazape.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/66494107666.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/33583232779.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/82256417574.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16091d001b3a69---70766571994.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b9cd94c06---biruzik.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/15a828b9d6dc1ac50594f94e434cd1e8/41634144359.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/906a0525cd8ccfe1945ba117d7b018bc/jamodetepepawekiso.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f0rahdk3dlg0l0hjj2q1fl2o93/6525712449.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/34207b3629a258ac30a57fa73d72fe9b/209767755.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/pagikobatodizotames.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074c9de2f56d---71099681680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E3A 5236 bytes
SHA-256: 94b1dcc293302c7086212df17b4a47628b3ca0799cedf9bd630687ef6ef8c68d
font_01_sfnt_off00014fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE0 12532 bytes
SHA-256: 9fd9394d1aa5ff1f84912c9b2c8b32dc68dc559f80c109e104f8374c41dd6b94