Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9579c958312ad8…

MALICIOUS

PDF

41.4 KB Created: 2021-09-20 11:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45022683f5e4b452583b73dc3755deb3 SHA-1: e5f3a5eeff254a7c073829011f50e512e8a65616 SHA-256: 8a9579c958312ad8376453e88f6047760012fe287cd4c47b2c57128057aff922
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The 'PDF_IMAGE_LURE' heuristic indicates it's likely an image-based document with a hidden action trigger, a common phishing tactic. ClamAV detection and ML classification confirm its malicious nature, likely serving as a dropper or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://vuason.vn/upload/files/41659034013.pdf In PDF document text
    • https://efckrakow.pl/userfiles/file/fotujojigezupilumub.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/df34cc9443f8463c42f82959cf5e45ff/81059446248.pdfIn PDF document text
    • http://grimastone.ru/files/wovidijepolin.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/82214296260.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/86066677234.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/18215768794.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/51884555584.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/51781469241.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/gowotadef.pdfIn PDF document text
    • http://watch62.ru/files/files/84961775812.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/45605996668.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/nupukebepedanazasowexe.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4d6e39c52---30456594739.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/34300942411.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/makepixujasof.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/65513666241.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/25569099802.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/nefijivir.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/4909526122.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/pinibepemo.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/pokemifowagawivazed.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/suluxodufupakadiwefele.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613107f0a30c3---sutisubagujufujuzufesiva.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/gibejat.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/pikukamuzoki.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/fozelijerijutotakapuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=insatiable+io+snakes+game+onlinePDF link annotation

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