Malicious PDF — malware analysis report

Static analysis result for SHA-256 286814c6c80b29df…

MALICIOUS

PDF

78.3 KB Created: 2021-09-02 13:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ff1cada726031188f0f3227754b0129 SHA-1: 10b96e3a3ada7ab240935d6de8d7274199f4250a SHA-256: 286814c6c80b29df8d3452478e172acf6bcecd4935963991d28397b177255b49
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5019

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://krisoc.ru/uplcv?utm_term=bluebeard+charles+perrault+pdf PDF link annotation
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c02b2c6853e---42588376346.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161261091165d5---kuvebumegido.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/17333731472.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1d7c6b0d---45666119051.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/betosiwozevenumigu.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/xateviferesolu.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/gefudabozeliwebi.pdfIn PDF document text
    • http://hhsbluebirds1967.com/clients/b/b5/b592d679e9980e62d9d56be1bfb8b6b6/File/voparimisixapudofuxe.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/4277523879.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c29c0917295---50783242197.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41082898175.pdfIn PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/24546971269.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/36faeea24ac412461f76373904e9fca9/pawad.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bc2337da70e244b1b5135ffb6180808d/sifoselusosuxojorikizejom.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/52145930320.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608028f09053f---70436596448.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609764e051c66---45118853207.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/vupibu.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210725184546165.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/48760552280.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/98028717779.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/23647020649.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EE 10696 bytes
SHA-256: d4839c2462505fa29e3f63face443e114ac379ed444b7a78e2c727085f18f4de
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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