Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbe1a7856df36fcb…

MALICIOUS

PDF

91.5 KB Created: 2021-07-25 13:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 657c488ed9b91200906f5e04d5eb44a3 SHA-1: ae141582e6feb74c11ace1a06f5b518e36959137 SHA-256: cbe1a7856df36fcb176021d0b1f6c2c53b6fadf2b8ce982b7fc6b96c7fe531d6
94 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or redirection campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5784

Heuristics 4

  • 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://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e761175af75a3d8cd43786c33dd12d68/sibidojowaboves.pdf In PDF document text
    • https://casabresciani.it/uploads/file/9301054331.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/futojovajawizo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/532e31ee68e91476e3c3c45aa98cf2fc/nigarovidajede.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/86f6d533fcdbf6eb2aafe4f082072aa8/murosuzidavikus.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/66286236576.pdfIn PDF document text
    • http://mrmax.ca/clients/9797/File/wisafe.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b86d33d4---82711126443.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a79781c5a---28076534362.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/69777787435.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a6971e4d8---91557878860.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d8dba8bc---39510827291.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/p0sp9rogva4clodp0ft0kaev6c/wegasotenudijofiluturobul.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bccd003795f---vefesutomun.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/galusunisafixel.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/thod00isjmedjuihrf8hfijh59/73738221332.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c7f4e90b0c35383a262b49bd895b9a22/36226828184.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/5bd26b421aaa0079dfe8e08e6f1e11f3/85955892539.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/5971786060.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a6791c8177a7d686fcb652aba3f50c3f/notolupiwu.pdfIn PDF document text
    • http://www.siposferenc.hu/html/86094296044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=multiple+regression+questions+and+answers+pdfPDF 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_off00011045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12857 18168 bytes
SHA-256: fdccf0e279cc8f3fbb2b65797c79bd3988aa8d6f673a4327b775a517d3fb0af1
font_02_sfnt_off00015887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15887 10996 bytes
SHA-256: 74fdd108581aaeae51307c7ced4348068041d76050f436ac672bc3944d7ef8dc

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