Malicious PDF — malware analysis report

Static analysis result for SHA-256 e332fc7d4b11a880…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 02:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2657e81e92b5541160b5bf970fb21f5 SHA-1: 37c5081842f78621f052bf0117fc4f2d818e5949 SHA-256: e332fc7d4b11a880c273916e42162de9e9fa97a97949ad7eea233a6dc4865678
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer, likely to facilitate redirection or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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://nomylo.ru/uplcv?utm_term=endless+love+2014+online
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16147b011be92b---tumivaxusorojoxiles.pdf
    • https://bdprescription.com/ci/userfiles/files/20944800265.pdf
    • https://fajanav.com/aym_image/files/19649326061.pdf
    • http://megalabsrl.it/userfiles/files/35926779029.pdf
    • http://traviet36.com/upload/files/zazelikivosudidorosezuzu.pdf
    • http://kimandyoo.com/userfiles/file/71552886887.pdf
    • https://ytdrive.com/CKEdit/upload/files/87446145285.pdf
    • http://amigo-shop.105h.net/upload/files/xubisomifu.pdf
    • http://graphicyazd.com/ckfinder/userfiles/files/walalujumodisutedu.pdf
    • http://wieswioska.pl/userfiles/file/81613206430.pdf
    • http://jngf.cn/files/file/32401018414.pdf
    • http://accessprecision.com/userfiles/file/83418076123.pdf
    • https://fong-cai.com/upload/files/zesuvapufurekipen.pdf
    • https://dananeye.com/uploads/files/202109040425352972.pdf
    • http://jfhcoaching.com/userfiles/files/44098060923.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/02441221a9fbd2a34d65835ec309727f/xaweweluwit.pdf
    • http://aviapartner.biz/js/ckfinder/userfiles/files/wezoxajonekugogi.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/22239705552.pdf
    • http://abwcrainhwy.com/uploads/files/41817979740.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210915_9CE5278DD0223472.pdf
    • https://virtualpulse.eu/UserFiles/file/92980605651.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2be30719---31546768984.pdf
    • http://naoshima-tours.com/images/blog/file/16199558030.pdf
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/22227970237.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_off0000d698.bin
c7ae6a2a5409c8ca8e1f112803eb98697f3d961f1f9a583bdc63d080e1deb703		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD698 10300 bytes
font_01_sfnt_off0000edef.bin
256fffe965b28610d413a43d13f648eefd46785a49b7e3525c4b94630e232e34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 18804 bytes
font_02_sfnt_off00011fc7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 16792 bytes

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