Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dfea920dbea71d…

MALICIOUS

PDF

78.4 KB Created: 2021-07-05 15:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5d843b55df7921177879328327df4d87 SHA-1: ea64a7158f54b48b86f06f315254c3f0af531d3a SHA-256: a4dfea920dbea71d0a43632bc3938da5277464a23bef27a73b7bddaebf71f3b8
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of external URIs and compromised CMS upload links indicates a probable phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=22+train+time PDF link annotation
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/8ojdohm41lhl2krlrk944uc6hv/1283561525.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/71998652893.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/46dhkf47rkn4sk62eteuta87hg/37096277826.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af985f61b62---beduzedegomu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d484233724cb9445113e88edeaa8f778/binupimefabomufisi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094638f6c433---poxupar.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/pugosakomexelibunalodusef.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c36ae7a7ea8062ae4d415781660e57aa/womosejozot.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/i4pt4b7pk2oi20o2brjkndfulj/lazolapowisiwobedaso.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/jidetawiporimuj.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/84c50802ddd971b27e8569de1ec71e74/kafogosije.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/76287843842.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/gotifosufuresedolujebume.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094107363956---fibajajovijus.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/99624053620.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ce1a24cfbbdb097833d121ba4c945539/96558558593.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ad85c6cf979---2734328351.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/68135328098.pdfIn 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://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_off0000d310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB22 16872 bytes
SHA-256: 2aae50558c919d3eef0b794661c7b3f129a4e1579d3ef9ec5ea24031827f9e87
font_02_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 9960 bytes
SHA-256: d32c0586eac5041d5184edff6998a0158116521685d46ddd327a86d3b108bbd5

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