Malicious PDF — malware analysis report

Static analysis result for SHA-256 3697e381ab12f0c6…

MALICIOUS

PDF

57.9 KB Created: 2021-09-02 13:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bb3a716900c4afd29dc434833965425 SHA-1: bc1f68aa563d42d529a669358eb22a3ea0321604 SHA-256: 3697e381ab12f0c6a7871cc81aee2dfc96940f4e51a062996e600977288ee48d
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8159

Heuristics 5

  • 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.
  • 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://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/d6e43d420aeef78f348b89b4ab2f82e7/matixenod.pdf In PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091d1ba1f8ef---57493106426.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/d6295871ohqrh9a2vmgo47p4gc/38683072231.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a487e703---69446373034.pdfIn PDF document text
    • http://cwesp.biz/upload/file/xokomiwefumi.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9609eee93---jomoseretirolitomubib.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tcbm4te45gd7pt78k2d9pge8gq/23705936854.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/rf8p0880jdh3e17luq1tsb1cod/gatamubananarozofiduve.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160814c9e05a0b---29256623775.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/suxif.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/sagixufus.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/302242091708.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb7b3789af---19258601779.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/34967411344.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/tajorexuvunizugor.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/10475e1035f4dd36c5193a86785edca6/regokojunoxisixizeza.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff0f9030a7---nevisurugog.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/136b422b16924e334f011d63ada818db/86673873672.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gfshh30nuee6tmu4kdahpfjiok/kotutapisumi.pdfIn PDF document text
    • http://atomleasing.ru/media/File/bador.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/muduxepeg.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34fce16d8---gigamemuxiluvizawegiz.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/47592884972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=quimica+organica+wade+7+edicion+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E7 14832 bytes
SHA-256: 4c77789d1d6348862c775a842aac7076e3b4f1e97b71f657368a4654648b860e