Malicious PDF — malware analysis report

Static analysis result for SHA-256 549788e1677cd612…

MALICIOUS

PDF

40.3 KB Created: 2021-09-25 19:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 630ca268990132bd166b960c29b8369b SHA-1: 77c2394de7c75655004ba32bb6989aa9191fab0f SHA-256: 549788e1677cd612feabe5b74a0cee07cb0c79a6f5a108ec3e3de191f7ad4f93
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is structured as an image-only lure, typical of phishing campaigns, with numerous embedded links pointing to external, potentially compromised, domains. The presence of multiple links on disposable hosting and WordPress upload directories suggests an attempt to distribute malicious content or redirect users to phishing sites. ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8834

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 40 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 https://smidgel.ru/uplcv?utm_term=the+virtuoso+streaming+vf PDF link annotation
    • http://vangphutai.com/images/uploads/files/44287088951.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/pozoti.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/16468254538.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/897a6d9bcadca1bf76b62d5daa75f130/xazupozerufajifadoj.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/11324084180.pdfIn PDF document text
    • https://bachson.net/upload/file/goxufirojibiluvetuw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b288a2f1---xitanudelefejujubigekati.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/28198297673.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/86905725489.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/pumerixowuziwet.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/86532339196.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/dinuradejunotaxilenif.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/34377686313.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/4855271405.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/miwabezilagafudaxagi.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/40874036125.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/78065139726.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/42394598727.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/ro7u25top2ou19g34ua54h03um/zoxexufelexu.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/zapizininot.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/fosigekamudakezefufut.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/lopolapakejodogofepIn PDF document text

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