Malicious PDF — malware analysis report

Static analysis result for SHA-256 c844cb9912aad982…

MALICIOUS

PDF

56.7 KB Created: 2021-09-03 09:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d590a8134a31c524b87a6ff4edc843b SHA-1: 091b0cd983fbbe35b29a9c2a1f2ec3d71d52cfd3 SHA-256: c844cb9912aad982e51845e6d8bf69bbcdf91878a222018acde85e3a02fd2dcd
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other domains. The presence of 'utm_term' parameters suggests an attempt to lure users with specific search terms, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6836

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://infrive.ru/uplcv?utm_term=character+traits+worksheets+for+grade+3+pdf PDF link annotation
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8112a1616---xedimoluwutor.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210519014339.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/ludasujevudikavuwafukis.pdfIn PDF document text
    • http://quaint-house.com/mujuvirawimefizur.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/wulabunixekuxavipo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9c693524a---kiwujetajiradazaxev.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c4ada62684ff62d42d3d4d6cfa5ded6c/nugidagadamu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3cd7501a5---31373659555.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16115880fe1bf7---xulotat.pdfIn PDF document text
    • https://airbays.com/userfiles/file/79744203573.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e12b5a3c2f9---63124382140.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/pepuvunom.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/fubuzexav.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/lejujusugavotubare.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c529acb3f---niwokimuxid.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/wizenugako.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/73768964796.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e005b2abef6---9097345596.pdfIn PDF document text
    • http://ghhs1968.com/clients/5/57/5762190d0a265df614d1f295a7060a42/File/51876317905.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ee74e343a---fetimusevupubebel.pdfIn PDF document text
    • http://bacsionline.net/userfiles/file/84753560244.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/44802946165.pdfIn PDF document text

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