Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a1e429653f8e07c…

MALICIOUS

PDF

99.5 KB Created: 2021-09-20 19:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5fbd68686f62587dafb0e59cf87a1e00 SHA-1: 3c646c696bf64c835a893e462fbbccf6633c1db8 SHA-256: 2a1e429653f8e07c6d35e0d31d64ac1752f4fa2d8750adee0152ef3d78af7a70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Several heuristics indicate the PDF acts as a link farm, directing users to various external websites, some hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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 http://alltimescare.com/attachment/files/vupijesolow.pdf
    • http://siamintertrade.com/file_media/file_image/file/95850294617.pdf
    • http://transgusto.ch/userfiles/file/sibinenika.pdf
    • https://efsanepin.com/calisma2/files/uploads/xilomuzosiwesiwixedasube.pdf
    • http://grandrosso.com/js/upload/files/jatunivofisexuwen.pdf
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fogitovatik.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256d1b5895---24577228293.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/kelizoxusaxujenape.pdf
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sixam.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/860os9iji2858mumfi2565mca0/28866643820.pdf
    • https://senfina.top/uploads/files/74540941717.pdf
    • http://korytnica.net/data/files/30119048515.pdf
    • http://besttailor.info/ckfinder/userfiles/files/gedutasizo.pdf
    • http://ippinnudon.com/uploads/files/banonapexesivof.pdf
    • http://naturenhuman.com/app/webroot/userfiles/file/xadobovazivarijumuvipo.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/39e9a37230ffebc6f4754272e6f8a12c/64326379885.pdf
    • https://xuantruongtech.com/images/ckeditor/files/govanogapulon.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16131772d60616---78863467795.pdf
    • https://afayl.com/userfiles/file/47551445307.pdf
    • http://klubalfa.org/img/userfiles/file/vujuwekoli.pdf
    • https://atlanticcompact.org/userfiles/files/vobalewakunemip.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/775b614a470bad377f761ec1d793364c/21659640706.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=tank+star+hack+game+download
    • 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_off00011e19.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E19 16792 bytes
font_01_sfnt_off00013630.bin
63e3b35c31c1b2d6ce6f2f9a772cd9bb44a19fac02c85bce57ec3f7f22211d98
pdf-font-stream PDF embedded font (sfnt) at offset 0x13630 10868 bytes
font_02_sfnt_off00014f0f.bin
5465358d7b8b00fd7404cd708afa4b6c1d76a8c67718e5f46983d5bd03132ef1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0F 18836 bytes