Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ee02ad95f97dc6…

MALICIOUS

PDF

85.8 KB Created: 2021-07-30 16:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c49def8c6b2c6e86f97bf9343555c4c5 SHA-1: 2dbfc3a05caee21e6b89a349768ef8926c23afc0 SHA-256: 56ee02ad95f97dc674aa25dd55a55bfac57249a9cad16f781a1236d05a9c1632
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the detection results point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=all+i+want+for+christmas+is+you+ukulele+chords+easy
    • http://gallery4walls.com/upload/editer/file/67731102030.pdf
    • https://hkbca.org/UploadFiles/file/20210722015435122.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3044049c26966999924dd9f73357f9b4/43061540954.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b50cc355b---sagelaxelorofuwigexozisiz.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/df2kbi5o1hvqg5pcnvcfdcqsg1/6318932204.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86f469f58f---vekezutevumetenazer.pdf
    • https://gangnampools.com/contents//files/rabinozovofusijukoxix.pdf
    • http://aaz.sk/editor_uploads/files/89402203848.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f113dbc30cd6cdae0320d99c975784ef/roxadikitemusometoxir.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/51702333794.pdf
    • http://www.kotolantopeni.cz/files/tubituzumozo.pdf
    • https://sluganarodu.org/userfiles/files/37166378026.pdf
    • http://amctop.com/board_data/editor_img/file/202106030056.pdf
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/9064a96cbd693d5667470c142e0146aa/vejewonekexaz.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/036b26b0c16b1eccec265cfcabc234eb/duroluvakuxo.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/14372816a5e7f68322daab5f87d322fc/wumumajoxubimoma.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f01e0bab286---95194685147.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/12084482404.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/88209185557.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/a26aaf33a6b7eecf1261497831951d14/nalumatugexidakuzisowipe.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f1449e79181d25ecc5227dd13ef4db79/lurozipewipasiganugulu.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4bb118268---rurakelu.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/l0263vd505cb8ksq5cbmqvn79o/3112479714.pdf
    • http://englandmatchshirts.com/assets/file/21318773939.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b340af091bc---fenufeteratabezim.pdf
    • http://acpiindia.com/userfiles/file/89616429141.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_off0000eba3.bin
f9db7e66f6136ab84d011f9f3de755647eee19ecc837c73e142a879770eff010
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA3 16756 bytes
font_01_sfnt_off0001170c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1170C 16792 bytes
font_02_sfnt_off00012f23.bin
3b1b4cf7c8ce6d9bf28707290498ee86be3ac356553d4f2a6ea17d5dee4843b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F23 11112 bytes