Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d72d12130f663d…

MALICIOUS

PDF

87.8 KB Created: 2021-07-26 01:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 14cd3ae4d131b95baab93c6323262cb3 SHA-1: 86941187d49d6e51fa0f45553e75ca143439eb37 SHA-256: c2d72d12130f663dcaaec122e78286e08ff885c9a5cc604bae71f4712f2a09e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the PDF structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://bazis-expertiza.ru/ckfinder/core/connector/php/files/zegowobanefi.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899313d2f8b---51409911819.pdfIn PDF document text
    • http://electroagro.es/pub/files/26767463038.pdfIn PDF document text
    • http://dd-eng.com/files/files/rodozetolubasigunomonok.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078b004c68fa---80089094143.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/66551674684.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/94552058586.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/bidezutimekorov.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/25fa595b8f6602894c567dc3e5c51640/90809320545.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/75507044351.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c889cc5ccef---79061250377.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/rawarinununezu.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/13935626758.pdfIn PDF document text
    • https://edarky.net/data/file/tefedomogapinononuxurew.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/63755561551.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160940b9454676---vudajavebi.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/5513518114.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/82ac5qc5jv1bm7edtqu484f5gq/87260153449.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c27f9aa0331---gigukavarelumagaxufav.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edbba34af0---81001060888.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca65dae816---mobatojoxuxeweliwofij.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f323433d1f---80447151862.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/rusebunedetujepafuxu.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/532fddcb63476989b4c9d5fae003e851/75951005412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+sun+is+shining+in+the+sky+guardians+of+the+galaxyPDF 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_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 17324 bytes
SHA-256: c3735375d03b5a0f474dd5037221d1656e737e210168a2f08eeedde3c26489a3
font_01_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 11004 bytes
SHA-256: 139601a506327e2b889c3369f2c22dc53e8c121cddd7eb1cbb8abdf188b52a92
font_02_sfnt_off00013991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1