Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f953e9323729f7…

MALICIOUS

PDF

64.0 KB Created: 2021-09-13 20:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07c89976345594b261ea275e48e07159 SHA-1: 6d5a777e6369cd9746444d0cf337631d70b7ea70 SHA-256: b8f953e9323729f75a00e441d7c8e122b98da1b75dcf3489d7a532a30614082b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, hosting numerous URLs that point to other PDF files, likely as part of a phishing or malware distribution chain. The presence of compromised CMS upload links suggests an attempt to blend in with legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8922

Heuristics 5

  • 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
  • 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 http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9f0f0f153---fasuwovutafizefixapoxojex.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f695b499c4---26750958744.pdf
    • https://sonntag-immobilien.lu/userfiles/files/75286591876.pdf
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/76308720356.pdf
    • http://darec.sk/files/files/41307581585.pdf
    • http://progfin.pl/userfiles/file/23611195585.pdf
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/29166278895.pdf
    • http://machulski.com/public/file/88506414846.pdf
    • http://sgd42.ru/userfiles/file/surazisidux.pdf
    • https://paron-rebondir.com/uploads/files/43193240828.pdf
    • http://kopdesign.nl/userfiles/file/mawerofirivakubigiliriw.pdf
    • https://shen-su.eu/gfx/userfiles/files/fenilebetisuvowigo.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/tmcti45tu9hejogcpcf47hg5p8/gufupafexijekusiwirewobob.pdf
    • http://winkeleninzundert.nl/uploadimages/files/12335786790.pdf
    • https://haciendaloscipreses.cl/upload/file/15869337720.pdf
    • https://semangkamerah.com/contents/files/nepaxu.pdf
    • http://trumoi-khutrung.com/upload/files/87894039669.pdf
    • http://gamjagolla.com/uploads/files/1108155009.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51b1e913d---53666537222.pdf
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/jivoradajegibilikevifube.pdf
    • http://ubestsports.com/imager/files/20210901181744.pdf
    • http://gayaarchi.com/userfiles/file/20210904194848.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ezcash+free+in+game+currency
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4ee.bin
03362bcc8e9b1a8373e1a41a69458b5b79462c959d4d3f823ba5d38c1b28522c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4EE 16920 bytes

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