Malicious PDF — malware analysis report

Static analysis result for SHA-256 29249dc3b6fbbe1b…

MALICIOUS

PDF

78.2 KB Created: 2021-06-09 21:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 05e97ea54241d12ac827745222a92f27 SHA-1: b7b702d2f12712834e1416819d9ed2e96ebe6d5d SHA-256: 29249dc3b6fbbe1bbd2107cba40d4a40d1bfc936a133b91a33cbaffa7a892e11
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure victims to external resources.

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://krisoc.ru/uplcv?utm_term=face+recognition+opencv+android PDF link annotation
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/e1c9c9f4b66522c8b4415fcfecd89eb8/79482841374.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fc0b4163050263d02a4563d65b7fdddc/dilunaga.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/wimiwubowo.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073563166bee---rimoxuxopexepisuraguvo.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/f49c864a8e9226f983de8cd5d30459b4/90858426834.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad60331cc15---tefewutopiwuju.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/worowubag.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997139c21d8---20273210006.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/musojosadiz.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4c50a15d01feed8ea4cd11ab46b83cbf/kenelisuro.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1974dfac---fegejorumiwuzinuj.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8b4db87f8---61522167559.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1261d2ae0---90808099245.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37b1828a8---71944108232.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/62122310980.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/030ab72fc960273dbcae6b1ea5db5467/7163767611.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee248969bb---2581913316.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b3a17c298b2986c495f1033bb3346679/11194707837.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 5044 bytes
SHA-256: 87e585ec4936b6f8375a6a5896f5973860b63bc884c6de7cd0e85eea80e96a0b
font_01_sfnt_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 2344 bytes
SHA-256: 00c8224ad94e87a3fb90ca40daa9abd28df88246dcc9e7f220b4441c89c5043d
font_02_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 11324 bytes
SHA-256: 21ca4d67065da0704f73ea04bb0e4dcd051e29101b0b5a52ad0a15eea9350a5b

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