Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24f715a91013758…

MALICIOUS

PDF

61.0 KB Created: 2021-09-02 23:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: ef2c30f709fc87af1fa02e07c8c53c7e SHA-1: 3f163b887ca704c01f25db9ab2c0ef64d2f313e8 SHA-256: b24f715a91013758966779711d5f21762736f2eb8be1327b7b939be9110297b6
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature. The primary attack pattern involves luring users through a seemingly legitimate document to these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5565

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://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6777417e1---56113590805.pdf In PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/kiretalasazonanojesedefa.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/fitosewutivileg.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/japaripiwoxa.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/77860693325.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/g7rdfstbg62b7kedvguq1r2lt5/37808011534.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/sonepemuse.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/14846927355.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97e7cdc5c---87173348733.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160873ab9b3848---30652256960.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609a41327fe69---79128159450.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/39e8fc2aa8992a3a357581c722e2d2f3/18886079133.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81066f27ab---22564103434.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/13607402104.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/71e7c4e18f603426158f41aef28e2a4c/8732811448.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tmusvjq3g15feiaboi2u0pkcmk/pemomudorir.pdfIn PDF document text
    • http://sbairs.com/datas/files/robozajowigiwalu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d64734f4c6---ximiwi.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/rosaboze.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/prqogk7bq4k7aj42lu02qjtun3/lisito.pdfIn PDF document text
    • https://digireg.dk/upload/lubawazexoze.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083621d9ba43---73212297234.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/mawevonipaxeruvatikap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=social+return+on+investment+pdfPDF link annotation

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