Malicious PDF — malware analysis report

Static analysis result for SHA-256 caa4bdef02354b94…

MALICIOUS

PDF

70.2 KB Created: 2021-07-03 09:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad0f4f7dd03068f8d2ae4816d0339fba SHA-1: 124014e2a13950bc454569d51c211e28fc27cda5 SHA-256: caa4bdef02354b94d01b50c46af847ca25a79ac711fee1ba4d1a67745dd4bda4
124 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. ClamAV detection as Pdf.Phishing.Trojan further supports its malicious nature. The primary function appears to be directing users to potentially malicious content hosted on these compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4729

Heuristics 5

  • 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 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://cungcapluonech.com/upload/files/duxapas.pdf In PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/xujuvixokutejenij.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/th0ur16s724d699ur466iuh780/molofuduwukujibuwebubi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a92059429---38199365624.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d288508f73---lozitedorimoju.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210622200557.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/69002298086.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/xawodepapunabelumewegafel.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/19085281503.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d909ad6d---zejaru.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/tefetiva.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ba6kibnuvboqrvvafg0su9soef/vivane.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/61985820632.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5f4cae1402737e197dac337e0ce686a6/vefivamujibotunob.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7877d39e4---77402722923.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/lorazajuxidenuwerunesego.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/guzimaledemeliseteg.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/fezipuvuneb.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/militij.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8472326da4---tekawok.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/kuwolo.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a0445d94---wixuziwofukus.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092297da4548---895810548.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/rimejivovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=watery+sperm+meansPDF link annotation

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