Malicious PDF — malware analysis report

Static analysis result for SHA-256 af091a9ee5a81776…

MALICIOUS

PDF

79.3 KB Created: 2021-06-03 12:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe43cba1f0d2a1747f350fbc2821ffee SHA-1: 55476feb33c3fbbad39f59112651148f4b311e7a SHA-256: af091a9ee5a81776c080e332271a8d744bb7e0f760a28d000ba8d0efd18b3492
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files or redirect users to phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to obscure the true destination and potentially improve search engine ranking for malicious content.

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 http://viprealestatebrokers.com/userfiles/files/40276523566.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c292dbd0e---gixuresopaxema.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/04015ee8353ff4fa1ed6aa9edb864465/lokuzazafadijabebumopo.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5a108b64---94763573567.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a824ba3c61f---famekivibideforuvokeviner.pdf
    • http://pusancard.com/userData/board/file/xerokilaxadora.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c76209e55---82773571717.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b79a0cb9383---11978226297.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/e64546414f3eb724df0c956accf271d7/40412895655.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829cc825698---98259645283.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pt0o3em1s5qgtq1qj1p8eiukc0/22252805548.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/61250b6672d6218b20a94de7310bae43/35749033931.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef706aa07f---woxikifigekevekazaxaterux.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a920eacad75---noripibalejebifi.pdf
    • http://absolutelyneon.com/userfiles/file/71021220405.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/75707469814.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608250c06f21e---salakume.pdf
    • http://ankurgroups.com/userfiles/file/bivezatolapefodedowibaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pdf+yi+word+e+%25C3%25A7evirme+program%25C4%25B1+t%25C3%25BCrk%25C3%25A7e+indir
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f23c.bin
81cbb7a65da805a0829894fdc54220861324145ede10f4641d131def82d938ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 5804 bytes
font_01_sfnt_off000105e6.bin
d0b8fb039f0c61cbd08ea0d6bcd2f42c693e12a8782c036e6551ea27ab0299a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 12472 bytes