Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbe840ccfb22e9ba…

MALICIOUS

PDF

81.8 KB Created: 2021-05-19 05:32:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb03028718280e0faa8630ca233a926b SHA-1: 372e5d2749b59f5f0803e222d6b8514d8ff2a871 SHA-256: dbe840ccfb22e9bad6f6d69052425a0c558efe0ce412f02d71548be6187243e2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8484

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://crewmak.ru/uplcv?utm_term=partition+piano+queen+bohemian+rhapsody+gratuite
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087e1294c0af---89152628387.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607660e7c2468---jawitupinexinabuxumumojos.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1a43553ee15c003555a7ac896f03e614/sorunuwoni.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/nbqmfc4886pm4d0sqr5gjrbff0/wuxod.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/midaxowodutabubun.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/2e65daf13cb301e60930610fa24a60b3/781274874.pdf
    • http://asbu.net/uploads/FCK_files/file/18613936663.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fa9566b7f710860a1bb50a547ec8a44a/kevisejuso.pdf
    • http://stardentalcare.org/userfiles/file/53592071546.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/61613b767a0ac70c46db0d2d94ea4b06/94001074056.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/1jdibtigbd67h7ib5608uj8khm/jegosijerewajur.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098c1668aa47---81672837042.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073be91e5f19---jipesijixewujogitavuxu.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f60366337c---vodabajaxusarujila.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d60b9133fe---43205067157.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9tln659308raag0c0bi19hd5g8/92603608027.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffea.bin
981476440d2bd2ac96e0699be036d58f15e3d7e30ddfa415c278733f087cd21e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 5708 bytes
font_01_sfnt_off00011314.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11314 1800 bytes
font_02_sfnt_off00011ba1.bin
bcd1848c27a407b57e74db1485d2fde964ea472fd2d0bd4772d6382cef26e796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA1 13016 bytes

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