Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea18b846797b7e0…

MALICIOUS

PDF

43.2 KB Created: 2021-09-26 13:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 80de8d100166a49394f21dea837cd7ad SHA-1: 609c3cd7d05504bd2bbe6f5e3f39b5c0dabe88c3 SHA-256: 3ea18b846797b7e0bfff5573d19db0e96b87d610047b49aabd65c4080a28e3d4
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7753

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=how+to+turn+off+subtitles+on+a+firestick PDF link annotation
    • https://mepho.hu/ckfinder/userfiles/files/rusinexasevilinobub.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-16/20210916135321323419.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/5219169454.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-09-13/210913045555175503ujxmgmv3dtgs.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210923145441.pdfIn PDF document text
    • https://interference.ajoda.eu/userfiles/files/noladopi.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/5065726462.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/vigapudepimaweban.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/93673138461.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/nadoseko.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/fomimibotunubu.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/12068857470.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/lerudisuvuwe.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138913326616---rixinufiwakumaxinapi.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/kupowaxifogavu.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/nuzifidetoxedapenok.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/30549226635.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/dugarilexoxizivoz.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab6b1663e---zaripiwarumimomenonuz.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161371c97b59c4---54066267723.pdfIn PDF document text
    • http://futboltotal.net/images/files/kakufuti.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/51045943282.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/8001508089.pdfIn PDF document text

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