Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c4bbfaa6f8877f…

MALICIOUS

PDF

68.3 KB Created: 2021-09-30 14:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fa6ca324213e4047bde51331782b68c SHA-1: 672ea039d1f7a67dc1bfed9d4a9170a953b33716 SHA-256: c9c4bbfaa6f8877f8b5f6798c57bcc0bfc2a333fe2381c1983ad24f76d2d1b29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=beyblade+games+offline
    • http://votejoedestefano.com/editorData/file/73036083015.pdf
    • http://boxerdapolenta.com/cmsimple/images/file/77009340835.pdf
    • https://10fci.net/userfiles/file/77629379544.pdf
    • http://mintaialuminum.com/d/files/dolipedisagegadigelifujuw.pdf
    • https://confetti-seasons.ru/upload/files/notomegonovegeli.pdf
    • https://petrovsky14.ru/docs/files/3845832858.pdf
    • http://dwornawodzie.pl/userfiles/file/95412495790.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/2a32ma1jgg90823bikpl13jlkg/53789668422.pdf
    • http://bezagsecurity.cz/userfiles/26737998649.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/698340713be29d5de528904e89d7f30d/23284104041.pdf
    • https://oncallanatomist.com/ckfinder/userfiles/files/29864093960.pdf
    • http://tcsklife.com/filespath/files/20210917235448.pdf
    • https://mayxaydungthienlong.com/uploads/files/files/pejel.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dd6e868efb---luletabojugaxorazujorifi.pdf
    • https://thefertilizerequipment.com/d/files/11721660132.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161402e8fc3cf9---84721014483.pdf
    • http://elite-nails.pl/Upload/file/24676407716.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/gomiwukitetegager.pdf
    • https://greenways.at/userfiles/file/51362186354.pdf
    • https://nirkongrp.com/ckfinder/userfiles/files/voleput.pdf
    • http://sobinco.cz/ckfinder/userfiles/files/rivebuzepepogoni.pdf
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/likuzapewidekiru.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad7f.bin
d4fffa293a4e4a15e5c33f0605ead2dff43296a77fa6204a52727cbc60a0fe80
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD7F 10808 bytes
font_01_sfnt_off0000c62f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC62F 16792 bytes
font_02_sfnt_off0000de41.bin
5801042648201b7b3b3bcb7b87d2a652d0811b84f760521dcef4643bc0568845
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 14960 bytes