Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3e338d9ef72c49…

MALICIOUS

PDF

92.5 KB Created: 2021-08-06 21:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13734abfbf9120f2a99fbf8abe0d7aad SHA-1: dfddb8cd819b21a59ebcecc55e765bb954d339f0 SHA-256: 1c3e338d9ef72c49be6719fce361f512f79483795536841e3078eda10db4f4f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://philabc.ru/uplcv?utm_term=recommendation+letter+for+phd+admission
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608967a3d4e03---74143839410.pdf
    • https://spotiverify.com/ci/userfiles/files/rujawoselajavoji.pdf
    • http://dobrasekacka.cz/userfiles/file/supasanojuxezujolabifi.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609300d30c2a9---40530663729.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/e3326adb8c726bf1578661b954c3da09/20215483916.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/de00e19e8925f42648b1c36f69afcad1/lirazamagatiz.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/aa8e6e80db208026e92473c7a0df7c40/vumowutilubegejarumeru.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e74d61a8301---90112632211.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3055138237---64635876983.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf3d3afa3---88951150559.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a65453c4b---61672498894.pdf
    • http://rioairporttransfer.com/ckfinder/userfiles/files/57322128487.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800ccf2f03---rofuzadojobipe.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/e75486813839322da7e13bb07ddfb86d/xovoxakuroroto.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/bd96ae0756b45cd99b3ff33f61c7abc4/vozasajozegaju.pdf
    • https://majorsagilekvaros.hu/uploads/file/rexakugagitutowelutopit.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af8fb1afe82---98782516330.pdf
    • http://phuwangnam.com/user_file/file/sosofawizizuzokanolojiti.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/75f2f9d9cffc69b937171bb95b676a0b/42097248049.pdf
    • https://akapacha.com/userfiles/file/lekededupudanex.pdf
    • http://wannawwannie.pl/userfiles/file/motozolederupemefale.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e83a2e3c56ab2b09b61d001871c870fb/panivipazeweximalasetulu.pdf
    • http://anhbanglaw.com/userfiles/file/kobezajedel.pdf
    • http://sola-brothers.com/userfiles/file/64121573672.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec1.bin
972da4e7c7cfdc13fa59d975ea228b515d98510d981b9c8fba07360651644436
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 16360 bytes
font_01_sfnt_off000128ce.bin
2a616f676b5a83e30f329279ad7b6bc6f5ea0fef5f620270566d296ca6c4d86c
pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 10932 bytes
font_02_sfnt_off000141eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141EB 16792 bytes
font_03_sfnt_off000159f8.bin
562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
pdf-font-stream PDF embedded font (sfnt) at offset 0x159F8 1860 bytes