Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f50c39ba2468361…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 11:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 079f4879b599c7088787c9b287ac2008 SHA-1: b9f2620aceaa2968446c4efc76f06956ca87a0c7 SHA-256: 7f50c39ba24683617c64105c56c26479cfab5a88b724c10ae0c6d470094b8c47
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and multiple external URLs, many of which point to compromised WordPress sites or disposable hosting. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document's content likely attempts to trick users into changing payment details or wiring instructions, a common tactic in business email compromise attacks. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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
  • 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=radiology+cpt+codes+2021+pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/a3pis2fem8r5fhm23r2j4gjn3q/tumosoposemevifisimujot.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d58a510eb1---fabikoxovexaferugip.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/bezabelagobaferipixixoxa.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/s1778cktnl8hutve90ldtu25a6/29485840299.pdf
    • http://cu-hinothai.com/ckfinder/userfiles/files/23664979525.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/hcdaklvu7lol9pk0ntnl1i62m6/rabimuwaxixawanav.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7a7d0a2fab997d0068198cc60f702708/34109294673.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15f7d102c---guvuvumowo.pdf
    • http://peneleos.pl/userfiles/file/87702728999.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68fbc5790---62637810987.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b683f2f78---65723395751.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bb45c0b33d3---sokefujal.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/sudonok.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a86374c1d49---fegakedigemeviniwetuzit.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/tanusu.pdf
    • http://asja-doll.ru/userfiles/file/95519833643.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/aefc83fd95742affc402aa5a51d2a10a/37707547473.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/hoohrdc2v97djk2gflucdmgopt/juzelipaganojujivej.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/5bf4b46bc2be00f8d2564a59a1356232/40917230640.pdf
    • http://sparan-art.ru/ckfinder/userfiles/files/90014902059.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7337e07dcdf5e0ecffc0370b8801f26f/xebedexulit.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070627d82ca3---98020973043.pdf
    • https://angkoronetour.com/userfiles/file/32774573336.pdf
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081dd9a751f3---37262573814.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_off0000edab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 16792 bytes
font_01_sfnt_off000105bd.bin
18e7888f2c39ff22d5fccf6ea563489d41a0f119643921fc23b002bfd2cba301
pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 17856 bytes
font_02_sfnt_off000134a1.bin
affe1db0b13fe50e090c3fa538c1ffc9e172bb972a6b6f96ae9da4fa4e19253b
pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 11044 bytes