Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8d14b8b7396659…

MALICIOUS

PDF

47.7 KB Created: 2021-09-14 13:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d4d16a0d3e307c358cebe4c7c9eb3957 SHA-1: 99db87ef9c1faa420167e9d2aec237b309db33b4 SHA-256: 3d8d14b8b7396659804538dafc3728631c241f942a136ce710d6588b7b2c834d
194 Risk Score

Malware Insights

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

The PDF contains numerous links to external files, many hosted on compromised CMS uploads and disposable domains, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure points to a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7355

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eaf3d0360---22850466934.pdf In PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/56751319828.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a41733a7---96003965422.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/69350176410.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/fopuze.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/mebulala.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/wogaboxubovunarenigazodo.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/8223796164.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/2523694528.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/7417760704.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613926fa38df9---35616468278.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/88489213173.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/folagutepupisenisawo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3d39681d---70523046442.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/24523817.pdfIn PDF document text
    • http://sin-hua.org/userfiles/37938533753.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/83954030819.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/kutevubikuzovagon.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613379b9c2f94---xomunilu.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/maxumakekovonuro.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/nulofenidabojiwo.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/51879801280.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307308523ae---fugazujobifexepuzelixim.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3fb2b8e7b---winepowufenumulemu.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/bapijarugerosimoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=felix+the+cat+nesPDF link annotation

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