Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb97d6abea0b1c3…

MALICIOUS

PDF

81.5 KB Created: 2021-05-20 00:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 439e06232f5622fa3478e2da98558a2a SHA-1: 4f51e284d612281a152c677288e5a01f1899805f SHA-256: dfb97d6abea0b1c3a59b8c4fa9365664b2229f600abe73b341604e4d0e6c5178
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, many pointing to compromised WordPress sites, and uses a 'utm_term' parameter suggesting a phishing or SEO manipulation attempt. The document body, though heavily obfuscated, appears to be related to car parts, likely a lure to encourage clicks on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9541

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://queure.ru/uplcv?utm_term=peugeot+207+cc+roof+manual+reset
    • http://ahxxzx.com/userfiles/202105/file/52535748300.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/835ac20aa70e898a709160098c10c95d/nisajaxemejet.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/1f6b0dd7049e8114491d618b27435512/suvifawojewizefiji.pdf
    • https://allcreaturesinc.com/files/files/49182093550.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086836e2ba2a---79640429012.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6090h4l61pdv0m9gv9jv17lgm/gijojenenagidojegibekon.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a51952f0e07---34931436377.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/07c0ad54431558fdfc0f4e47764569c6/42759649242.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/029d18dfd6f7e3af2bdeab7204812d53/saritufosevedifox.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/48652bc033cffa301690c81165ffb80b/643335350.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a196d0aed31---12657520128.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092521c7f268---tifoladojuwerexesusilelik.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8847071bb---25180913069.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/344eeabb8b2ef92ca997af3b93afb159/80191076321.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d19a6b4657---82702639951.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d1160a5b8---modababilawu.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6uf0dk2eesq2uoi53f4rk06pl3/11910918511.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bc8.bin
bed29ff77130a7b525c84ddf38565df9654037efbdbf1bf25e5a95eea1c4b520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC8 5556 bytes
font_01_sfnt_off00011ea9.bin
41fd2aa6e5debfeff2eb2e117fa12bd2da539e8534c7679c438724917e718b22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 10856 bytes

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