Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16922942dc99aff…

MALICIOUS

PDF

62.5 KB Created: 2021-08-18 22:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ac05b9482ebffd402d659258cb0921c1 SHA-1: 1078ec5e251c899d241427bd6fe5838d073c1030 SHA-256: b16922942dc99affe7719f75ecda7e522f804977c84bc4a2ec179b2fee4c68d5
154 Risk Score

Malware Insights

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

The PDF sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. These links likely lead to the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9569

Heuristics 5

  • 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 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://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//rofaxuvibewikibefafa.pdf In PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/78402c5be6986d65a38513c3f7cb9a93/64217902674.pdfIn PDF document text
    • https://educhina.mn/editor/files/tofawafuwodugekuso.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/23167877717.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/wejije.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/pumubowiwapi.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/64043783904.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/f2sfmo6k3rteu9cqcd1h14fvft/25524504196.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e7d67b2b378d418955f4f8796032dc52/rewifosatijixopi.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/9956961089.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/86019393776.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4207a0fc36c453ac89c42b3c32c12310/durasusapurijotojikuxuru.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/53770586390.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c5b9edaed---14914381974.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6eeee6478---11917561135.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/kezivigedukekisu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/42j14u2i7fgrcb78holdgnmaue/10204112656.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0535818001621213084.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/nelomadikusori.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/93604272012.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7d409acce---vepafojoseribizorovajo.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/xedulonirowaberek.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eff44465e---rapevajekupajapoveze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+are+three+properties+of+polygonsPDF link annotation

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