Malicious PDF — malware analysis report

Static analysis result for SHA-256 33f64b3c85c86bf6…

MALICIOUS

PDF

65.7 KB Created: 2021-06-21 17:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 614cddc3cee3c24e4366969f21bcbc3a SHA-1: bcfc3e95774d89298f7fd867cf266e17da512033 SHA-256: 33f64b3c85c86bf6c0a21053d6257c4eb083af9016aea3fdcd4667be2535f05b
156 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme disguised as a police verification form. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing attack that likely leads to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://foto-klub.dk/userfiles/file/34625566038.pdf In PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/5b218e8da6bc002caf19e4d8df910f7c/4933658599.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160980af1c404c---dojiwujupogujovemesipoku.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bo57v4tg7c6taqpn2o9l8786d5/bopapunepeva.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/leishkri3nsonr131mcpuq5qdp/nanomebano.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160738d76df49a---42893139591.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/fuwesifexafoxolepip.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/a1628062350fe6fbc4fca32d1486c86a/66154965963.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/1691958173f7aef8fd07b30831553ed6/kikuwuvasebujizowezumo.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/739861f3d07a1ac7077aebeae486dffb/lowabulifidevovoxijuk.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/domevusewinuwegunimuma.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ef93edad---39466551475.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3af443faad---belojapapulo.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d13cf6571f---mawodekuv.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/be9bca38bd8be1cd7f032f6ff11ad4bc/modak.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/48929923561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=police+verification+form+pdf+downloadPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC391 5276 bytes
SHA-256: f434dd538941ba5b25f95e67f58436183aec083b3c90d4a95995e2833119c2a0
font_01_sfnt_off0000d584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD584 10532 bytes
SHA-256: d3079b564bce1f4e98a5f60d3fc126a7753c487e1552baabfa7322052d6b535a