Malicious PDF — malware analysis report

Static analysis result for SHA-256 a86f262f4f036d1c…

MALICIOUS

PDF

92.6 KB Created: 2021-09-03 02:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 590266c010ccd11b9128ece58b49a8ab SHA-1: 939606d56e9378becba4400daa334bc4f514e9ce SHA-256: a86f262f4f036d1cbae519f2f87fbbb195c07a444315104bc75322d431b24767
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 http://dietaltop.com/userfiles/files/wetikaruna.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/62c6a55cb9c5bb373a2ab8c6bfa50850/6246359736.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/kowasutatatexixasov.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qer9p1ocgoahcv8arvgui0i6lh/sonamon.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/28891036155.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/vipolivefelixiwez.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/15349a87a7e2286cb6fda77a55016965/40981555636.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/tuxokakuzejidagaram.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/losuwonawugak.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/59114089925.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/3478pjvl9kictkjlccp3salvmq/51224905232.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/podixigizuwalizatu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f313f0c75---gizugumupavorawidigubokij.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1e47edfd74d9e844ae4a06b2818b8247/nugopusag.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/52fc32ced6914737106368164ad4c12b/47753512395.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/48853508686.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/96265583710.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/2c8fb7ecd3995f40f2d52ae0b7e8a29e/metemafixerixemile.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087d10559398---10924578269.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1611022020218d---lufodekafegagoxuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=le+dihybridisme+cours+pdfPDF link annotation
    • 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_off0000fc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC04 22532 bytes
SHA-256: 0f4f8992b809c73fd5b8f03ecf9ce7226f90d264f9baa45c6855decef49e2799
font_01_sfnt_off00013438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4F 10784 bytes
SHA-256: ff0a6995952646240a72bee818f64ebfaa1edaf9d0aa68f20b3b00e093dc6cb9

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