Malicious PDF — malware analysis report

Static analysis result for SHA-256 4172e62b87aeb410…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 01:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d70c2978429e4b5e3d90d37830e6b1b SHA-1: c0e5421db636b11a2174c29792fe715b15227394 SHA-256: 4172e62b87aeb410188b628c9865dc70346683886e100c3e2f4bfd27d6d4ce14
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript could be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8902

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.
  • 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
  • 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://mayinmaunhat.com/upload/files/josazepetesarewitu.pdf
    • https://whiteplacard.com/UserFiles/file/wowororobevagaza.pdf
    • http://nifaelectronics.com/userfiles/file/beduvekafokavezibadizetox.pdf
    • https://brothers-music.com/ckfinder/userfiles/files/jizupironejilowajifamilu.pdf
    • http://concilianavarra.com/userfiles/files/nilazotowesiwag.pdf
    • http://njboyuanchem.com/upload/files/36757361291.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16130841688b36---xiwugowefe.pdf
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/fovinoxiki.pdf
    • http://kleinschadenexpert.com/userfiles/file/vefatijitedumuxunurodonix.pdf
    • http://rund.cz/UserFiles/File/97126518997.pdf
    • https://innovativallatgyogyszer.hu/fileok/file/kegokegavuwe.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395552d92a1---87486316952.pdf
    • http://rent-lease-no1.com/userfiles/file/20210911020017.pdf
    • http://lexus-custom.com/js/upload/files/91265901273.pdf
    • http://praxis-greve-polley.de/web/editor/files/ninada.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/35e7c3b61dc3d19aa0ae50e8daad703d/rogikub.pdf
    • http://sbriz.ru/userfiles/file/25942140335.pdf
    • http://stmarysharipad.com/userfiles/file/figoxozi.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614329a8b75f6---8312398906.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210917200304.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=lulubox+apk+mod+download
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE127 16792 bytes
font_01_sfnt_off0000f93e.bin
0c7745401fd37691a81ace716de8e3465028f51daad6aa8d08cc8d4199c20e02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 10440 bytes

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