Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6c7f762f312140…

MALICIOUS

PDF

54.6 KB Created: 2021-10-03 02:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cc8e9fa5363a3816066055656239720 SHA-1: e788c5a35896d911770445eb3632ac4e02522381 SHA-256: 4f6c7f762f312140be1b5a483aaa0f1d4d23ea96f2edcf6b68d82874719936b3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the primary attack pattern involves luring users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6665

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 https://huntic.ru/uplcv?utm_term=unit+4+congruent+triangles+homework+7+answer+key
    • https://kozlovka.mebel18.com/uploads/files/68409783995.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613858156d3d4---29699459543.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10209be01---91733450632.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/80529877412.pdf
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/23527794383.pdf
    • http://gabident.pl/local/userfiles/file/wanewobolisowesokugu.pdf
    • http://tortsurprise.ru/upload/redactor/files/lamusodow.pdf
    • https://wiltech-hk.com/editor_upload/file/zomon.pdf
    • http://tko.wavedev.net/img/files/files/kulituliwusawutokuworirow.pdf
    • http://xinyuemu.net/assets/202109/files/20210909224153787349.pdf
    • http://cmtsport.com/pliki/11758516007.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/87215844560.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161506fda276ca---91261288655.pdf
    • http://nato-denkmal.de/uploads/file/jozedifovofubow.pdf
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/20279926743.pdf
    • http://garmaclima.com/uploads/ckfinder/files/95902811737.pdf
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/40139062233.pdf
    • http://asu78.ru/userfiles/file/54050810642.pdf
    • http://djk-winkel.de/images/uploads/file/44425398160.pdf
    • http://mertcelikkapi.com/userfiles/file/nixumadog.pdf
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/70200654181.pdf
    • http://recit-de-vie.fr/userfiles/file/dowezal.pdf
    • http://vitanova-cattery.com/upload/file/disefivuvudolujinavizaj.pdf
    • http://wienbildarchiv.com/upload_files/files/48521412595.pdf
    • https://cs168.tw/upfiles/editor/files/76698750226.pdf
    • http://pilatesmystyle.com/userfiles/files/63559517670.pdf
    • http://phutunggiahungoto.com/uploads/files/80893838653.pdf
    • 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_off0000b52f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 16792 bytes

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