Malicious PDF — malware analysis report

Static analysis result for SHA-256 6596c86ebd1bd5f3…

MALICIOUS

PDF

117.2 KB Created: 2021-06-01 05:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: fd382ab732968a728502b5efdf6c450e SHA-1: 7b6fde87a191f6e5d6b92140175510fcf544200d SHA-256: 6596c86ebd1bd5f3354c02dcb2ad425c3f95ae875aa5c082d46b38d012ee5b15
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or phishing sites. The presence of embedded URLs and the ML classifier's high confidence further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9760

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 https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fe5cb3e23---zizosaberuxumubujeka.pdf In PDF document text
    • https://circolodelpistone.ch/userfiles/file/fadedemisufe.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a81b38fe60db747467080157c046cb92/49351828447.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffe789660a---gogavuxufudoviwizaferi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d615dcae99---13416407710.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/raf1ppsca9a5p2dr1k3ov62ia7/93993805816.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/e0005d3d643e829c6c088d25a203df06/vedir.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/d7a7a18b0ffd78ce6d566231703cdf8d/xizovetawa.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32397b7eb---pudakex.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/cb14cc30ddc847519a333ce249ccc285/redabegozunexike.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/fazimux.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071e2588a4d7---torosoviwu.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/78cee0769343f7163f659af3d7f6b019/dedifonigogamuwegurapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=why+did+islam+spread+so+quickly+dbq+pdf+answer+keyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1812951fd1---laxorisorebatuj.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F21 5932 bytes
SHA-256: 86e5c5aeeb995bfa4a7c5a4d01e32357d9bc7cb9e71607d2c7af4490fc5be21f
font_01_sfnt_off0001b344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B344 12840 bytes
SHA-256: 0a8459ce6024c30dceebcc8f41d96062277f3cdfa0d8db1e57ab47acfcf941e0

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