Malicious PDF — malware analysis report

Static analysis result for SHA-256 684f5b3ecf929176…

MALICIOUS

PDF

70.3 KB Created: 2021-09-01 10:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ad50b1c18ee14445d566b8e54537c9d5 SHA-1: a6f0b673b50f9d96c6177bdd7f7a98fc33364f82 SHA-256: 684f5b3ecf929176a4219aca2fac2949f61418c51930fdf3a5ce4c7290c0407e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious sites. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8434

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9c42d9715---varumupofogenixe.pdf In PDF document text
    • http://rallyteamwalraven.nl/file/71202572645.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/93700838426.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/9650576466.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9256dc3d---tezetaxudatexefag.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/kupijiluzasedija.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/gewodojemif.pdfIn PDF document text
    • https://photofetimages.com/28651923206.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/mozubedafe.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/nulirogawodigavibi.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/76564514180.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/71167366318.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/32113851160.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/72238980076.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/h3t030nn3umstdrtfba134n5ff/55063954134.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/68996006506.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/94723676848.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/g6kpr88d35r7il03u2f6k77cti/lazusixujakezemubefetosup.pdfIn PDF document text
    • http://starkhigh1972.com/clients/d/dd/dd83d6d7846a033806cdb512e10d7d7c/File/71841525016.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/58666209208.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/44880019839.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/pewimegebirevoxavelukep.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/89920020792.pdfIn PDF document text
    • https://bem-sa.com/img/file/9972258589.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105091911507076.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f7d8bd721f434d1764d967e06ab49874/1802940532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=brussels+sprouts+meaningPDF link annotation
    • 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_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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