Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83f9ca834644dae…

MALICIOUS

PDF

59.5 KB Created: 2021-09-19 13:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bebefc1efde023ab7d58d5575c6ac96f SHA-1: 9a199e72079ac49283a0bbecde68ce3e5cfaa2c9 SHA-256: c83f9ca834644dae7f81e2a83ab0deb8671d42365bcb79b48016a74cf2e9c1d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised or disposable domains, characteristic of a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5305

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://demo-calson.garment-pro.com/ckfinder/userfiles/files/32095078951.pdf In PDF document text
    • http://elskup.pl/images/assets/file/tajaxit.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/wapitekosuvujiranizi.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/34273656558.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/5cd364a4dc23fb8b00d8aa1daf11342c/nagizunevubuwozisogawoj.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/kitux.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/vogubetipevipinufuz.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/44147809220.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/39943434745.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/fulonefoseten.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021090416143241.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/52806159640.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/8917353758.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/sedomuwob.pdfIn PDF document text
    • http://istanbulballoons.com/ckfinder/userfiles/files/kikozomoret.pdfIn PDF document text
    • http://naviway.su/upload/files/30125210637.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/nemuxededated.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/dufekupusonisinuved.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/3783656102.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/totikugavikotetas.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/wulupubu.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/90d462e4686e6eb2365dd7ce308830bd/pewabaw.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135412435066---velatikebutisapove.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=google+maps+traffic+api+androidPDF link annotation

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