Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc9cb2eccf91c0a…

MALICIOUS

PDF

40.1 KB Created: 2021-09-08 04:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2eb96f372b487389ed8e28095d7bd28e SHA-1: 5ad0cf849dbf27dd63e4b99f2dde331f3325d5e5 SHA-256: 5dc9cb2eccf91c0a62ed998a3bdaa469b6b0f8f8308bc4b028f57b3f07ad9337
174 Risk Score

Malware Insights

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

The PDF is identified as a phishing lure due to its image-only nature and the presence of numerous external links. These links predominantly point to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8966

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 http://jorkurojus.com/userfiles/file/jipobujowa.pdf In PDF document text
    • http://texmet.pl/userimages/file/75877649078.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/rasizupefimubidofowovifer.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/50242450524.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/gesixubev.pdfIn PDF document text
    • https://x-software.cz/data/file/75670379112.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210508195946639.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/75983036422.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/g4vcddnk225tig4fu6br9gd2jt/86162526357.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/mamaruj.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078133337e49---lisatoxebet.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/nolaziti.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/58243121733.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/46248916642.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077fd49db211---vonewenomiluwatanubod.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621626899.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/taduxowudufi.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/jilijinuditesafinedajosi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606e944584c22---jironosubati.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741ffbf1c8f---27062980062.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/20524999148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=handwriting+letter+g+worksheetsPDF link annotation

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