Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2cebf9f2cb2447a…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 16:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d96f751b3e07c2f2fb64bee0729f6a8b SHA-1: 295e67e4e2085dcf99983ffe386147862095da9e SHA-256: b2cebf9f2cb2447a33eb64cff76e702c4582d9b8aaadbd008fcbaf3fa2070f9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues about its specific purpose beyond the presence of these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=fireboy+and+watergirl+2+unblocked PDF link annotation
    • http://asbu.net/uploads/FCK_files/file/mebikidiwosirutumirigexag.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/7853188256.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/95390324227.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/gigasokunisiruvewiwukik.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631259341.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/29759115577.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/cek8gd7rho0bla2ik7jo032d38/77522941971.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zalomonolapidovuwep.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/moxujuligenep.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b2b2a2aa---91240058159.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/botamedepulelibakinefiwun.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/55639355818.pdfIn PDF document text
    • https://icbacademy.com/upload/files/68886372231.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/74961367789.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/sivukirulokitogijimofapej.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/dabuwoxenawofumipolunaj.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/kecb7812luoqtu0f4004gumhl5/41595182919.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27702f704---warofutefujozibi.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210919202152813.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ac3e4173f---49200769888.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tofimowasopolozib.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/89456890214.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/vexedimarewadakapes.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fface065410c971d444f11d32b7aeab9/38944193746.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_off0000ca3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3D 11008 bytes
SHA-256: 6a115b367f87114a77d6934c2df2df6559b5e7896de00c31ce3608bd0b5b3400
font_01_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 18888 bytes
SHA-256: 266dee75405502f9ae6c6c91b861e127872a08811eb7323a35bfa7ad4f0c727a
font_02_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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