Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3084a11f1aa3e06…

MALICIOUS

PDF

69.6 KB Created: 2021-05-25 09:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3abadd7a3b4dbbaf66643acae909a1c2 SHA-1: f9af892ef5c423e40d76fbe06f5552d55f60af58 SHA-256: f3084a11f1aa3e0679e725161cc4339edde191ed6791cdeb5946c62c998a66bc
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. It contains numerous links to compromised websites, suggesting it is part of a link farm designed to distribute malware. The document body, though heavily obfuscated, contains keywords related to game hacks, likely serving as a lure. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

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://medvor.ru/uplcv?utm_term=pubg+mobile+hack+android+2019+no+ban+no+root PDF link annotation
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5bc61fb98---kijojo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/rbq8b8pe0qg6crdbuqinls8ob5/mevurixadorubav.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/81175107567.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160953ccd838d8---80883963385.pdfIn PDF document text
    • http://beiks.info/public/file/pezonedorepuxiv.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e6e3ebe0---80287207422.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160874de2a297f---rakajujivuzokipofezelefof.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/4mu20nu1ih4df0sif9i24erp3u/60291093436.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/viligukategebonolugexar.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607129f212dc7---zetewisafabak.pdfIn PDF document text
    • http://yilip.net/userData/board/file/91459872987.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/00012a55fc9de9e121a0754d97f1b073/duwaletegepobumuripadas.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/727c6b702ebb1020c25968c4e36ad001/mikanepumana.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53b903118---70335193061.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a829962b795---65242754492.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab512978e1---dorivisopanod.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_off0000d29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29D 5864 bytes
SHA-256: 20a2b56acc59f006cb71ccd63e894b05968195e42b11bf75bdde9285242390b4
font_01_sfnt_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 10108 bytes
SHA-256: 199b56577802d55b8c2169f12aa03e668eb2d2f40c26e5806e6f2d569d8519d6