Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c611ad0db19f0e…

MALICIOUS

PDF

46.8 KB Created: 2021-09-20 12:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e01da43f6eadf4b78ee705bee2dc216 SHA-1: cda3d078c4dd1a4c7809e3f50edf30254f0383af SHA-256: 19c611ad0db19f0ee80f94f30edfb39af25fa4de6d526bd468727c842a7b501d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external resources, many of which are hosted on compromised websites or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware delivery. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7471

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
  • 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 https://crewmak.ru/uplcv?utm_term=coding+game+apk PDF link annotation
    • https://rossbeede.com/userfiles/file/56108086723.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/25fca1edf0c794da52441996cff043d7/59183643543.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/folapevupiriputiz.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/mezolejemajafa.pdfIn PDF document text
    • https://sadex.pl/fck/file/62744508219.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/karotoxakajurezukaneriwid.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/061121426357.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/sizaxuduruviromoriximuwim.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/1197333584.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/kinepameguxasokuko.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/57621315464.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/29703652727.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tuzit.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/98285955965.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382ec032a5a---kirodefafebedunukizafaz.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/gezovixipigiw.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/bivukobalexav.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/kemowanilaronavuzam.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/17618539368.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426f235a970---28707521507.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/90268063262.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/87578121496.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/fominixaboraziw.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614641e81da4a---52975381284.pdfIn PDF document text

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