Malicious PDF — malware analysis report

Static analysis result for SHA-256 82502837f8be0679…

MALICIOUS

PDF

70.5 KB Created: 2021-09-06 23:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1667b354895bb4a50ba5b163a100e2c SHA-1: a6250ac15d6ae19845617e6b86be4f6c828f427e SHA-256: 82502837f8be0679bbecdb0b4da462daec088491160a0feed19374e7fad05a75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress sites and disposable hosting. These links are likely designed to redirect users to phishing pages or download further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://laborke.ru/uplcv?utm_term=catalogue+roziere+pdf PDF link annotation
    • https://alquimia.in/admin/fckeditor/editorfile/25879572318.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0c58b695dc8a69ffe54a5a4f0820151/tigerebakopumebut.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711826f207b---80849843856.pdfIn PDF document text
    • http://myesen.life/userfiles/file/78367856610.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/bejarin.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160750ca9d6480---73597904869.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/furawi.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/wefaz.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/d8j7m2atggh0afps2fksfe5bjr/74686753924.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611138c73a886---jaxelurulofef.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a7bc6a642f7af8e983deb0ad1a304489/kavuwa.pdfIn PDF document text
    • https://digireg.gr/upload/vaxeniwesupaxetin.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ced59a5a6---tojepezawetuzij.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/ropakanotomanowomaronogix.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102ce11b35de---nubezewutitamaka.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/52286248729.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/mavijasezorerigivinodu.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b4b81ca8---53911895086.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/golojelovek.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/49536776820.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae48386c10---68912687943.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/kulogiw.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6321617be---15598505774.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/1e69c96ddddf420f46083330b6d91fff/66653380023.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be432b33b4---24921881376.pdfIn PDF document text
    • http://palami.by/images/file/6004832068.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_off0000b5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 15324 bytes
SHA-256: d06aabe71555257415c4c41558fde32aea488f7c80ecf206539b1d2aa52a10ca
font_02_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 10592 bytes
SHA-256: db4aa63fbf3de7fec63febc6c9c0f1c9901ec2c115fc59c28c169e36ab203126

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