Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f3049d4113b934…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 20:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ce47f6382f1c47ed6e358cdad5e8d2d6 SHA-1: 5b8a4e90423df4efb9a16431de74c385ca341305 SHA-256: 54f3049d4113b9343493c3cc9fc60dbd2bcf1ee94c83d9827cc908a65f3d6bca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.nevjegykiraly.hu/userfiles/files/wonaxagukozasijekasodaxik.pdf In PDF document text
    • http://danangsculpture.com/uploads/image/files/kufavilegaxivomofoj.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210912001857.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/25850536210.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/72566400627.pdfIn PDF document text
    • http://creationart.hu/files/file/60095448585.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/35416223941.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/nevozin.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e3f4ebf34---ruzodub.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/dovinaxijasezuxiromo.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73470311527b00dc1b48d8508ba548af/buwebizivula.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/zofoweperix.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/ramefil.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/71503629417.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/pagofididuzelureribalep.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6753e863---kobekutikami.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/49967645705.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/limeja.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/82079697372.pdfIn PDF document text
    • https://atlantidegattico.it/file/sevijubejazup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=watch+indian+matchmaking+show+online+freePDF 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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 11096 bytes
SHA-256: dfca097e937edcc9523268dc0e04e7e70475f08f17b933e53d2a2553a42cc7ff
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 18164 bytes
SHA-256: eb46bcc56b71ffa21172dbc22c92d22b67de0ffe0c7e97bb553b45b2ae02893d
font_02_sfnt_off000126e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1