Malicious PDF — malware analysis report

Static analysis result for SHA-256 015e2a5e8b4d8a6d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 12:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1f34e3dfc463ae93b63731f8c2af2f81 SHA-1: c1e51d71310df110383de6679d378c5bc5141269 SHA-256: 015e2a5e8b4d8a6d8ce4a952cd7f95ebab051782140ec0a02952705019b8dc58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs and links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM indicates a tactic to obscure the true destination of the links. While no scripts were explicitly extracted, the nature of the links and the ML detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=colorectal+cancer+guidelines+pdf PDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4995f8c4ebe7cb3c42ee78f749e57e66/72396174135.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/jibasagusovurivatonixa.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/govipipixamogom.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/revisivozeb.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c63d8f3482c03228e1e1dc495d825349/30036379394.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/50722904260.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gibubejawazel.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/62c8072f8b9fb8cd5af6b72aae8e9689/99174660627.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/76248632560.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/95631d3066c7982e745f53c743d9a236/dolojurawabusaserazop.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/63521053937.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607a72f8e85ea---dozuw.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/fuledapedajexugi.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5838541ae31dd51f991c6245e7fffbf7/fenewopujakiz.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/virin.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/88828ee145ba8f9ebb9df1bd02b6b759/79522308757.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gm9mj7b0ap9e1akui4fhavr2q2/karetasog.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160825aa74a614---70735089684.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/763bd255d3920a0d2ad097e8d3823d20/98230234835.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/gifamibeboridaxev.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/vivobolafuvabamemese.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/75660113623.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/83739019546.pdfIn 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://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_off0000d61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 10928 bytes
SHA-256: e7e8c0930cf54cd159ed42791496f91352a248c4aae44f6d3bb535b7b8013277
font_02_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 16608 bytes
SHA-256: b6622e06026fe8f56279ce7a1c1edb737aa5a08241e38309ce1056c2a6dac0f8

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