Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba10c3e795e2774…

MALICIOUS

PDF

71.7 KB Created: 2021-09-05 18:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f2aafe1223fe5df08395490bafecbeb1 SHA-1: 7dadd8b09586bad40bf204945c54b74b6f50f900 SHA-256: 4ba10c3e795e2774250de3946cec97a15ffc45ec8dc5a2ff871daaf43d6d2d8c
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5354

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://3e3i.com/UserFiles/file///95690738406.pdf In PDF document text
    • http://intemhathanh.com/img_duhoc/files/40692063324.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/28566127174.pdfIn PDF document text
    • http://yoron.net/up/files/3337815721.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/gl2qm1ecvhcp608e4h6ph0kk93/23377826029.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6367de65fe---66134708314.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062105480425.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/156806007860be006175e27.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/60348892910.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102fe0d78710.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/62ac5e17bbaa676a9ac750698bf57aa5/85430392338.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129d6dfd7389---82384092995.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/abaf01dda326d69d1c1539c2f5bf14db/zopubisawizotaz.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073830f77891---30063848515.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/82767339485.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/5190432626.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9883p2dmvobiv24nuds44lr7m7/xitimupasubobijodixadera.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/819554358.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/21983012.pdfIn PDF document text
    • http://tele-video.ru/upload/files/4667699637.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/86695871271.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b1d0270ed2227a5b62f842fd784c4e09/46863105833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=manual+labour+definedPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0D 20224 bytes
SHA-256: ee22ffe93684037cae9f99529d01b1f546dc8f44b4b1387d7f473ff2157b8ac9
font_01_sfnt_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 10316 bytes
SHA-256: 17e6148ca73867c4e4ceae1980452afa7900e996c40f50c46e0fc5c8be634ecb
font_02_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1