Malicious PDF — malware analysis report

Static analysis result for SHA-256 c048ca27669726c0…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 13:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 481fd6f114ea39094b7fd99f9a2aca6c SHA-1: d57c643d1b77a8287a665547752c29948d47ec40 SHA-256: c048ca27669726c0ece4891749baf702bd5bc38d46785e5a604bec309c9555e7
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the final malicious destination. The primary attack pattern is likely spearphishing attachment, leading to exploitation for client execution via the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=b%C3%BCrgschaft+wohnung+eltern+pdf PDF link annotation
    • http://abwingstop.com/uploads/files/95804346154.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4bab3d88---vizebawaxulidorugoj.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c6bc522e---rutuloxaj.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab938460502---sidifusopega.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/56389439515.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9d66b79c6---vunazekunisugofas.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/wonedazirevom.pdfIn PDF document text
    • http://jp-cable.com/d/files/leruxeb.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160796492407b2---pukevituzevurusoruxuw.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/vunuxasosalafizib.pdfIn PDF document text
    • https://medtek.vn/storage/file/tiririjolu.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607330a7d4515---xuriteve.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/p8f9t22dnp5tt0qqpejlpndiab/nijamevipozula.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/15290413520.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/99109485535.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f7309aad---6299667896.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/dufebebapoxajoxow.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb596a46de---78240101437.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8166e0d7---40756424865.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/82468480132.pdfIn PDF document text
    • http://jfe.hk/userfiles/batojibixumepimot.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/cpuu2adturenvespjhfpde7977/14233816170.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_off0000c01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82E 18272 bytes
SHA-256: f3874ee02a08e2388722e3dc26786b022c3f91348a5cb36b3c39123cf7befeb1
font_02_sfnt_off00010633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10633 11240 bytes
SHA-256: 4bb030ce4575780ae14b79171c96687987ee550d4db3c61f52e98a2c346fe7cb

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