Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b34d7355b619521…

MALICIOUS

PDF

70.8 KB Created: 2021-06-05 05:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 10a3be8b1d89187444ed78365e569511 SHA-1: 2f1309fa708149aa0959d23bebe5be0a919b8adb SHA-256: 2b34d7355b6195211320c8fec0470c498a6f278adf8a81709d8a186467a7cce8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. The document contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/uplcv?utm_term=menschen+im+beruf+pflege+b1+pdf+vk PDF link annotation
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bad92bf2836---vorobosux.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/20990672702d65bd8cdb7a6806b0edd8/fosaxowomobiminutu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082ef6732733---jetoveredugevidawamu.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/tahseb9f94vb73dkup48a0ddtn/6361246107.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af621464a09---vevelosimavuserebujowirok.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abef46e49e2---45219336730.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/o5p9mqlpb0n45e7uo5di83ietb/36111449869.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94661ad8a---penuvoliletexawux.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/senukivakajepujigerodolu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b205a4a688a---garugitata.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/42593626391.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0943c95749---buxiwisijujebogikara.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/kalozoda.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/nozunarulatubomori.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/35148434270.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/kopoxekojozibuz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB82 5680 bytes
SHA-256: 2d12afdf8aac17cf3672b5d700a8eeb25ec8c4e61ab970b33dd553d4a94d2e99
font_01_sfnt_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 14692 bytes
SHA-256: acbdc2b167eef05b2f16d8ebd3b6a8060f4fe385c0ec0f258fbbdd459d1ced37