Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8ff4acbdaf1d3e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 08:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ef28ed1ad40e91c399c250269092f6e SHA-1: 9b3a7dcfdfa4bd2cdf1efa7f80d737f92ff903de SHA-256: fd8ff4acbdaf1d3e6f74262cbcd4af5deec29e9f76e3e0525811afc99eca7314
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The embedded URLs and the document's structure suggest an attempt to trick users into visiting potentially harmful sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pixomot.ru/uplcv?utm_term=the+x+files+season+1+download+yify
    • https://ddnepal.com/assets/userfiles/files/62925676828.pdf
    • https://vsetinrally.cz/userfiles/file/96130935922.pdf
    • http://uk-finansist.ru/userfiles/file/65488108598.pdf
    • https://dynasty888.com/image/files/20210904_163439.pdf
    • https://actorconseil.com/files/file/xeduseruduju.pdf
    • https://feniks9.ru/ckfinder/userfiles/files/64385096288.pdf
    • http://sibaco.ru/ckfinder/userfiles/files/46696886422.pdf
    • http://athaj2.specialty-match.com/upload/files/lumatagibeb.pdf
    • http://cluboutletmoto.net/campannas/file/23256132056.pdf
    • http://pinxedien.net/upload/files/sosidarumesidazizebiwanos.pdf
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/47540475161.pdf
    • http://tfh-filter.hu/_user/file/81278358739.pdf
    • http://timandlor.com/userfiles/file/92181699412.pdf
    • https://vaitinhdien.com/app/webroot/upload/files/ditetixumu.pdf
    • http://maschimaurizio.it/userfiles/files/kotojemilawabab.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136d58d3f7ac---wanatolavefaka.pdf
    • https://austarpharma.com/upload/files/gadatelivorelerudati.pdf
    • https://beeshark.ro/app/webroot/files/userfiles/files/sajivenuguruvumilijo.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/7887006518.pdf
    • http://pevak.info/UserFiles/File/71403713109.pdf
    • http://danieldesignpro.com/userfiles/76898242601.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313e442551d---44965627149.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/6cb324b9e5bbcd17547928673798bbde/kepamefalomutemisu.pdf
    • http://alhambra.kopanramen.com/uploads/files/lilesot.pdf
    • https://turbooto.vn/upload/files/nodugug.pdf
    • http://konstruktor33.ru/app/webroot/files/files/kugupesaw.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_off0000d144.bin
12b1de9e0e1f5f0948117441d738450c1dc5f66fb775b0ac9ec0d175e01f789d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD144 18032 bytes
font_01_sfnt_off0001001c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001C 16792 bytes
font_02_sfnt_off00011833.bin
8b2c622f77ede8eaa027eb79230dd4c8b533dec831cbf71999e5339fa4f6da6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 10568 bytes