Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fb92fd96a430e6…

MALICIOUS

PDF

68.7 KB Created: 2021-06-07 23:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f542dd13545ae3d89282fb3338fb2d6 SHA-1: fc15192025bd7b6a82a839de401c03518b841678 SHA-256: f1fb92fd96a430e6c98b3cf6b4ff86cb147fbdd15396887a1015127e4467bb46
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though partially corrupted, contains a title about fixing charging cords, which serves as a lure to encourage users to interact with the embedded links.

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://pixomot.ru/uplcv?utm_term=how+to+fix+charger+cord+that+won%2527t+charge
    • http://pokorny-podlahy.cz/UserFiles/File/30000411582.pdf
    • http://csptech.net/admin/userfiles/file/71091000325.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e87c26cc0f7cc70cfc20432cba2010ab/54303961269.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d3cb2169b1e34f3d572ad52dbe60343c/ligijagufibabitofi.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/430635e21f14b8138111df67191968b0/25567840808.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160aba21b1967c---miwejameweta.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/201g8bd8re8inns7a4hu5on0b1/80007633485.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6838dc78e---favoju.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/h2b0vp4lipncblrfbjm4fi1eh3/8334495883.pdf
    • http://sllight.ru/design/img/upload/file/lanagufomuputesopixozesod.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07b050b64---zitoziwivi.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a288cf3dc3c---34051196626.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_off0000cffe.bin
4e7f10fd0d42c025267dce3bce6265588f50680ee59fad9894ff1ffa480458a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFE 5228 bytes
font_01_sfnt_off0000e1e3.bin
5807a85ec86c1872d550659cd069815eb019447c6214925086d11548d3a3c489		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 10544 bytes

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