Malicious PDF — malware analysis report

Static analysis result for SHA-256 8492af89fdd84280…

MALICIOUS

PDF

67.4 KB Created: 2021-05-25 00:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed1a255dc6c03395cc317b2a8995a5d6 SHA-1: 5cf862da7dab801b7909aa3510c1758666479a13 SHA-256: 8492af89fdd84280a589055aadab78a5d193c07b091ed44bae2886eb98c125bb
154 Risk Score

Malware Insights

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

The PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely lead to phishing sites or malware downloads, serving as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9695

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098eb404d2c9---romibabuziba.pdf
    • https://veterinarycarefoundation.org/userfiles/file/nosefetakegobijogoputobu.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a81aaa3f9f37e08c1c6fb67a419bfb38/39336197226.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b7b7f452---zufur.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b3cd56850---netagubevokoliwixejivepe.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cf8f0d4a3---dezadeverisewelenute.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/q8d2i4itncsd4hpoqmua0n8l67/15645927492.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/h5gt3upskh26ngrc7ds3ka3otu/50297565699.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/zivubefebenen.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3498cd1925---84904337216.pdf
    • http://moreit.ch/productinfo/file/zevuwesoruk.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609831bdbd2f6---6245626021.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f336572a2---gadonuka.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/gq7qg60bmvenic3hut8jpebf2b/nijawarovevanuvifafu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=are+post+nuptial+agreements+binding+in+pennsylvania
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fe.bin
142586366d5ea0e612e7469b2f490b7e8e0115ef1ad8f01a9b5443f2f59fd530		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 5568 bytes

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