Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b0a52fb92609bd…

MALICIOUS

PDF

73.4 KB Created: 2021-09-24 10:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 00699256b9708f98aac93e0b308618dc SHA-1: b3418d97965ccd05fda1102ef1314c92993a93c8 SHA-256: a3b0a52fb92609bd843e780f3bab83a91d41829cafb27e416418cdc97abbd718
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5898

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://hoangminhphatkorea.com/webroot/img/files/xibosemuforikevototoxifuj.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133716a000b9---78645252236.pdf
    • http://ressourcengarten.de/azubi/userfiles/files/60836805138.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/7rtgfcl50jalvhnav3av3tela7/3657669618.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zelax.pdf
    • https://auto826.vnpec.xyz/uploads/files/40313317253.pdf
    • http://auxerretv.com/content/public/file/gidovawizariferuwelani.pdf
    • https://peltonfell.org.uk/ckfinder/userfiles/files/duxavijefivepowuze.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d82bc9225---33550825064.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd2f3d9ac---29237556604.pdf
    • http://sibinetweek.ru/userfiles/file/zotunisegatigat.pdf
    • http://grandfiltr.com/files/file/77388348873.pdf
    • http://cartopack.be/Images/file/nalapijetemokezukeladikar.pdf
    • http://re-media.ru/foto/ck/files/bigima.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/93755695659.pdf
    • https://taipeitccia.org/CKEdit/upload/files/kabax.pdf
    • http://group-anons.ru/userfiles/files/13103326084.pdf
    • https://creativitagh.com/pevron/www/img/file/35100892382.pdf
    • https://biomedchita.ru/imeg_master/file/desebanosopamaxaz.pdf
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/5081307321.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/432484739.pdf
    • http://logicparcel.net/uploadsEditorfile/vizifubibonuduvotosiso.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8f0eaae516731403af0ebabad382809d/kavebelodid.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=plex+pass+apk
    • 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_off0000dec8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 16792 bytes
font_01_sfnt_off0000f6de.bin
724e939878f9c2baa3c4d465d2914a3c3c389988a9500e73be642a72efee37c9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 9928 bytes