Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8c8c9633c8a379…

MALICIOUS

PDF

80.0 KB Created: 2021-07-26 13:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b48176294cc4de223af1fb4d60d24cdd SHA-1: 3284529af609bdc6e6070569e23ebaa6f39f41e6 SHA-256: 2b8c8c9633c8a3798fcf9132de7d7e92ff2d0fce612927e15da62e78ad405b88
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5306

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 http://abwmechanicsville.com/uploads/files/84500026053.pdf In PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d21476538---vovozakojewidak.pdfIn PDF document text
    • https://egca.fr/userfiles/file/moxeladesimufiguwegiw.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/44fe22cb859b3396d66a438d1e96042d/17622587180.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/sopetitefojinigifug.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/bewulo.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc1080e58d---netemizajaromu.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/xaresit.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/7aeafddcb216134fe96629e610534ae4/5766680189.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/77844262262.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/xizegew.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7989caee33---soridutogoma.pdfIn PDF document text
    • http://fructusartis.com/i/File/95782742154.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7d63ad4c---63940296387.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/dejaganavod.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/757673c963da0c2f0d9b4a9712ae7ee1/tamara.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a32542a3432---vizodi.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/kojajobasazeloponofuponuz.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/vemamususegopan.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/towiwixedekojosugapazot.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/59752860674.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8998d6578---vigifisawewajuleguse.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dee27e1a83---29498879584.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/3080887271.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/91107120293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+detect+si+joint+dysfunctionPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 10584 bytes
SHA-256: 6e239c56ffdd13346794ab2c3c3ab7e659839fc7439fa4d09db9c0d6f5e83f84
font_01_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 16852 bytes
SHA-256: cbc922d9b49584ced939b2607a7b6a39c4dca7ae0e093f88953fe4ef12170ffc