Malicious PDF — malware analysis report

Static analysis result for SHA-256 5675af658fe0b65b…

MALICIOUS

PDF

198.3 KB Created: 2021-05-10 02:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 891a029c59ba9851274aef7db45f91b4 SHA-1: 70c9f044fd7898a118594e98e01263108f882708 SHA-256: 5675af658fe0b65b5080844e6aebaa55e95ae32fd5f6ece18c71bd85a1108e88
132 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It presents multiple links, several of which point to compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious content. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9449

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.
  • 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://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210508211323377937xgh199.pdf In PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/l4bt1nfijaosle6llqnh3e767t/86007082797.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b059aeede---99247078488.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/27172117284.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712e69dd291---42031852076.pdfIn PDF document text
    • https://andrejc.si/files/file/nalivebodinupor.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fawizozowadoxaragifuvetu.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb2926a37---femabijuzekusitiv.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/91541429dfd70e5fdc8b52febc8881b3/jafofetaxolinisuxizorozab.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b440acc8---nozajifisusup.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f86363d7e---4103002456.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382e84badd---fipugirivupojegidigav.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/92fl6s5av34ics8bitort6n6sm/82356937840.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/0nr5sv7tph3gcmu75cjolfcupt/20530241548.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804021dc830---ruvinodipuxopuwevesozix.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073101e8c349---mezabopuro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=aoac+official+methods+of+analysis+2000+pdfPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002e1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E1BE 5664 bytes
SHA-256: 749f6daa094e3e2d309ea62ce7c9182f0700a5c7f33571ae1e084e6308e297ec
font_01_sfnt_off0002f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F4F2 12964 bytes
SHA-256: e11993e111dd23520d8bd58f06828c241b436044a40c88fadb59b23924d5c864

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