Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5cf493003b9979…

MALICIOUS

PDF

63.7 KB Created: 2021-09-07 18:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 048fd8361668180628a4b099476fed0f SHA-1: fe998aa967091783fb27a127a3c0307176f32295 SHA-256: 7f5cf493003b997951c86f5c2a339e4887ec718bdc2355797eb91f80a25128d5
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URIs pointing to various websites, many of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7155

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://medvor.ru/uplcv?utm_term=combinatorial+geometry+olympiad+pdf PDF link annotation
    • https://latrinquette.com/upload/editor/file/dasuz.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/92698264367.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3erfmkpsuv0akfpu78gt1aett1/29597385210.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pusako.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/30600795033.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/46633524298.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e968d937a3---xupotula.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/95175458360.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/10466132342.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/44501361682.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d154179bc0---vesarodup.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/xufati.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/bijubawudosilelatakal.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160902c37d9488---rufililoxe.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/26332809561.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/goravegozukadojeveton.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/9179e2a558d049770eae577c52b30fe0/22087045158.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/67239170496.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/f0gfj8e5846egnej46r8ee12u5/64868739989.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609315a41e6c5---84691619774.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f82c074c---39243577399.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/78695374947.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/6018672044.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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