Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47a959e9e2bc59a…

MALICIOUS

PDF

78.2 KB Created: 2021-06-16 05:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004256217b9b8a537b98975d71081df3 SHA-1: 27a8acb1dde8b328c8bc27bb98e3d24139a6d64b SHA-256: a47a959e9e2bc59a97d5b55c5d0488e5cdebf92d37d75245b4ac3d4fed1b0812
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://huntic.ru/uplcv?utm_term=my+singing+monsters+how+to+breed+pummel
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/9609fd3d6928b0f5cc0b7844ab71609b/79234207760.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa137079f8---gomexonebufisaro.pdf
    • http://airsoft1.ro/files/file/tovederusori.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1608b204ce68d6---67835741106.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e45cc500cb4ff9597035583fc529f968/14813361837.pdf
    • http://com123.vn/uploads/file/32861373976.pdf
    • https://braintreeclinics.com/app/webroot/img/files/23094748549.pdf
    • http://93564497.com/userfiles/93027982942.pdf
    • https://kisikana.hr/userfiles/file/warupefodef.pdf
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/95264me02fmi9ejp1sjcg5o59e/mosatinenogafiso.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a77537d32f3---91548856873.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/25o9j9e8qkq3kucl31qt2rm9q6/gozenur.pdf
    • http://portalcom-b2b.es/img/user///file/_0183307001620318783.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_off0000f32b.bin
c10c921cf71a9ba02f353e2a5a98768e97858e9ea43ecc10fdbbe5de19ace0b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF32B 5500 bytes
font_01_sfnt_off000105d4.bin
352752dad1b601ae2553ee1c30a619313c827a76e63db66c4c05d810b123888f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D4 11044 bytes

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