Malicious PDF — malware analysis report

Static analysis result for SHA-256 54538bc3e0325353…

MALICIOUS

PDF

73.0 KB Created: 2021-06-29 14:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0de63e4449aaa8d35346d8da56b29b08 SHA-1: d33327dc17e22d1172a7f527ab69d2227ffab9d2 SHA-256: 54538bc3e032535391aeea722734811d6caa6fc862988ef96467ff334c4af384
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=practice+of+general+insurance+pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070605e4236e---kumubobezexipub.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/8717a0s39jj6mrte8vkc8mvisp/15464045909.pdf
    • http://tryinvest.eu/userfiles/files/jerapipezatof.pdf
    • http://dzbnf.com/upload/file///fedanir.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3c1c7829---levomesexekudodewizat.pdf
    • http://mmbc.cz/_data/user_files/file/64935459476.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/91605b1cda477c71b21855708ad8a5c6/94295573582.pdf
    • http://studiodabo.eu/userfiles/files/mobefevalunepotaxesekewed.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/65123525fd7ca623c4bf23c6c8d14b2e/24204860625.pdf
    • http://midel.me/userfiles/file/50523406288.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5879d1db64---79455971248.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8a4adf15fc498124bfe3def237abf21b/49299705439.pdf
    • https://ubk-sad.de/azubi/userfiles/files/38634744672.pdf
    • http://andrelandberg.com/userfiles/file/7466555825.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9dc09d0ae---firememogujugovi.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160852c127970d---53179216233.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/741808bd1c4a749512d8c06fba5483be/45598991642.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/cfe948130c4291ea046f48e4875eed53/11379950939.pdf
    • http://domainecomps.com/documents/files/29239644484.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa5b6a611f---5413179346.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/c874759d07c49441a7cc7618a55a7fdf/jovomanikux.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/notolibebokowowosazop.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qf9d8rq420rt033ll6a14iipeq/xolebex.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f3fd0cd28---tovaxevo.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/441a4e326706b3d13e64f083184df530/2334605422.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_off0000bfad.bin
0c41554e54925c415454b901efec6fd9515006ba3ffb8a99a4fa50a32a3ed62d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAD 14948 bytes
font_01_sfnt_off0000e593.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE593 16792 bytes
font_02_sfnt_off0000fdaa.bin
6121790728e51d67c535f250bc7d021af782b311321f1b8d71cb4e2c3b3c70f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 10896 bytes