Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc75362b0f86d8f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 09:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e7d30e180cb176094fa56bfb422913a5 SHA-1: ae3ea8eab5954dad7cb9553efcb4b336c8be72cd SHA-256: 2bc75362b0f86d8fc2804ad88c6282311d94ce4d621e55f8a8d9a55c2e06ede9
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and does not provide clear textual lures, but the presence of these links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://arabadvertise.com/userfiles/files/bafizuwobimajavidubi.pdf In PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e32c4b9d0d---71162335158.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/99956742288.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/81972250529.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0319562001627037482.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/xanujofamesef.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/3e0664d2a94ea5b98c35a54ed0529ebd/kubilogor.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160788d35dbf63---getaraju.pdfIn PDF document text
    • http://stattus.com/assets/file/68775415365.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/aa3137969a619c569a92f005df00fc4e/38034979752.pdfIn PDF document text
    • http://faptvmedia.com/userfiles/file/kawubivoxoxoduretoni.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/76495857033.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8aa180923a4f61af4502e902484ed915/sexasepoviked.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977fa65b6f4---gakuziwilunumubajazifesuw.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2750d64b76---40435511206.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/gulos.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/62894636474.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/48619164481.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/vulinikanuzuwodevo.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/ee32dd6a76cb258234c6cefb756a6d91/nivigukevikugamidi.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/453cf75dbec9edb690ec334f5b7af343/kuxumufomimanemiwepaka.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/rodoloxe.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/38949172705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=11.s%C4%B1n%C4%B1f+matematik+fem+yay%C4%B1nlar%C4%B1+pdfPDF 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_off0000c7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DD 19012 bytes
SHA-256: 16ef1428747cfa15d7433b2bba3dfe7e9b1bb8601749de81c4f7d90611e0afa2
font_01_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 10812 bytes
SHA-256: 8548716753511d7c3209dc18c81ad07cb7e083b6e0bf549bd50254b1957eee37
font_02_sfnt_off00010fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1