Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e37a3fd28292cb…

MALICIOUS

PDF

56.7 KB Created: 2021-09-18 04:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 203888615eb0fc3b6a21323e9827dd58 SHA-1: a104e9cb191da0c569b120019cf4e98b0d508999 SHA-256: c9e37a3fd28292cb13023a55fb25d637cf97be2d4d6eca4e3e8700cc91d670c7
154 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' and the ML classifier further support its malicious nature. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6212

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 http://medicaldistri.com/ckfinder_files/files/19465253465.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134711c254b7---66295445302.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/75367632174.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334b120913c---44189486608.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/10516383211.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/21223939234.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/11662345935.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/juwodadiki.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109100955174513.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/3313710303.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14c781b11---65580398668.pdfIn PDF document text
    • http://tavio.su/files/file/4902609864.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a83aa4fa94---50249770365.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/587a75eba4919819e655480a5cdb30b8/nofuvubixipezerusozinu.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/fogutewetobu.pdfIn PDF document text
    • http://packturf.fr/files/9451470613.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/4219629845.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/sarokokelozok.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/47820921743.pdfIn PDF document text
    • http://proleague.dk/userfiles/file/67559417379.pdfIn PDF document text
    • https://badrivishal.com/media/6548323638.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/77548605033.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/boxovabavavik.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/98320881971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=app+video+live+wallpaperPDF link annotation

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