Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cfd97c826254152…

MALICIOUS

PDF

99.6 KB Created: 2021-06-14 09:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed676fd47621bf8414b1373b01ccca7a SHA-1: c00fad02fe909abf66fa06795ead823246a77fef SHA-256: 4cfd97c8262541525d2252633baedb9765bc2549850fe1f957a1b950b40f2941
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, likely serving as a lure to redirect users to malicious content. The presence of external URIs and a high ML classifier score further support its malicious nature.

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://irlanc.ru/uplcv?utm_term=martha+stewart+roast+justin+bieber+full
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160824d9b0b953---majameravak.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2ce8ac9847c3879d31f491277130463d/17579154601.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hhh52g5117g6k1cklijnseuqn7/midoreguxoxukuw.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/37a5785ebb3d8ea72a252a23ddab3acd/98323342855.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/59c1c288f79efa9d7a19ef806a816811/kekudabobutew.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f77d9d105---14737445473.pdf
    • http://voszveszprem.hu/_user/file/viromarove.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b2d70907b---jivukiwotipenif.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b195e276257---91085759021.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3d7da817b9980696c8b12660f18aae53/mepetidabijupopi.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bed0f3e08ef---govokobisusemugotojelo.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607246a4c8de6---70382255688.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/28feac5c8afe6f9ee356f20591c0d3a9/39140219633.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609214d991986---44996871442.pdf
    • http://zjqzzx.com/uploadfile/file/2021052422592373499.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_off00014891.bin
3aaf406aa2b558d2c43c33c359d6c48eebb2512d41ee5606ae517078761060f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14891 5168 bytes
font_01_sfnt_off00015a40.bin
6a8a359cc69a729df6aee0729048689c646fea18613c235277008092a54bee9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A40 11812 bytes

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