Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0c6563fef7db24…

MALICIOUS

PDF

59.5 KB Created: 2021-08-12 16:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 416aef1d1ad466909cb870cecb7024c2 SHA-1: 2a814c2af188a2bd64ab3b9ff44d8a082a21ba9e SHA-256: cb0c6563fef7db249bdb44a9a6bb16811df53fdb0d15fd4b44408b64cf8618ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs to create a link farm, likely to distribute malicious content or conduct phishing attacks. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

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://pistant.ru/uplcv?utm_term=corporate+business+card+psd+template PDF link annotation
    • http://vencedor.coop/images/admin/file/82342785669.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/widutevazejugosi.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/sapofesepogetabekipam.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac379c05fd9---42238992520.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/9345529073.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/74217067690.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/4207137954.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ae9f89af8---biretiwozekumisizoforiwa.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/10834192855.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/ridolufuse.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210728_13807F38DCB435A8.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/vesarolusadojopujapatumug.pdfIn PDF document text
    • http://meskerjager.nl/media/files/70814055825.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4bpp862m1oji03v1adgvlek0u7/88714549815.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/kuxere.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/gofepabuv.pdfIn PDF document text
    • https://ivaco.it/file/rojowezabizawilobiwaxam.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/01fk5ac0fe1c7djhglcoenrie0/61433163353.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/f06c320e2d416052a9576fcbe02a7fae/16558010683.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/daxamazemaluxomexo.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/28265450973.pdfIn PDF document text

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