Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6608a541d6dd56…

MALICIOUS

PDF

80.1 KB Created: 2021-10-05 17:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ded6ff4d91f58287d0a2805173182014 SHA-1: 15d6e91493d99cd8182f2ebd8f8544f8b851cdbd SHA-256: ca6608a541d6dd56f8a6ddf5cb9ce9fccfc47a3a82ffbe690b21f7a20381d8ad
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs, many of which point to compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests links to compromised WordPress uploads. These findings strongly suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4855

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 https://krisoc.ru/uplcv?utm_term=to+the+end+of+the+road+song PDF link annotation
    • https://digireg.com/upload/58217172499.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/lamula.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161508201b5e82---92435476598.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/sunazej.pdfIn PDF document text
    • http://wdnederland.nl/file/kadanuranasidipa.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/gexoxegokazemovebenazaxud.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/45620618999.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/giseluruv.pdfIn PDF document text
    • https://novsport.com/content/File/62250854199.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109012327228344.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/90071769929.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/popijapewamifakijotati.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/jifomedoripogofolezulexib.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/44410581353.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156f2c159019---fedakinufogupekiwoz.pdfIn PDF document text
    • http://contua.org/userfiles/file/76010474835.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/3739400225.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/lesuluzojogawidemeb.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f7bfa8b72---87172251145.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/merorusirulobojowaj.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161409c1757544---19183411784.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/54082200891.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/60530325079.pdfIn PDF document text
    • 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_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 20072 bytes
SHA-256: cf883496baa937a486c0251877e99c5f1c958e174d4543e5b5d5f91087f7f80b
font_01_sfnt_off00012918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12918 10460 bytes
SHA-256: 1c3ba36f9d087209d11e0ee8ca8eda73d3585c706d381b680e37b99d2b343052

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