Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9fee24f443de07…

MALICIOUS

PDF

68.4 KB Created: 2021-06-26 10:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1785402736d2d393096c160ae7cd3e67 SHA-1: b7035c85a824cb5bd13d27e2d6f94f855596029e SHA-256: ff9fee24f443de0741e83fdaee5c8d8961db36c442d5123798d65656718871fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to exploit users through potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9391

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 http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608974c9dac3a---50744565797.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abf7891ca7a---14355144193.pdfIn PDF document text
    • http://splogservice.ru/content/file/pezol.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/65085874981.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5589667e---38464510106.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b836e23cffe---42440095672.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/61922100112.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/7jik3elqf3ndrc583l7o59de12/97138190463.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/42944018684.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d7122bda8---lamanakibenatubu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607673cbb6219---48547888516.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b6vasrjqo7oeecosv7oh89f2m5/fananugijixukikoput.pdfIn PDF document text
    • http://mebco.ru/images/file/logawogiviwomuzuvim.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/9773812156.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/jerupajago.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b3d87693f6b8a0bdc29c2416eb3cbee6/62872977349.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d09e1342b3f1bdbfae28b8429b781bb1/vevogo.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210607_59C4A995587F7F5C.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/9eslc1nl1ruaadd2m27cs6k5dj/bazewuzog.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4e0315415b8486423426c0bf7fc67929/kidivogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cracking+the+coding+interview+c%2B%2B+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_off0000b9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EF 16344 bytes
SHA-256: 086bbed5518183f38b6ac65f3529322b70231c44ff8bfa25ef2a68c473afa3d4
font_01_sfnt_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 10960 bytes
SHA-256: 6ba4d4a2f64181ac8f2bf15e0ebc6028fdcef899db24a5b07479258f1b274923

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