Malicious PDF — malware analysis report

Static analysis result for SHA-256 499b4a85daef8de1…

MALICIOUS

PDF

54.7 KB Created: 2021-05-28 02:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f79237c9465f987c55a1e099403d7470 SHA-1: f9ac9687f9144aa1607ed51690b043cff2940b22 SHA-256: 499b4a85daef8de1f736c1a0debfd4190dfc8267fd44c048b60db705607eefc0
94 Risk Score

Malware Insights

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

The PDF document contains a lure related to a Venmo account issue, directing users to click on embedded links. Several heuristics indicate the PDF is a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9701

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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607990d8abed5---20063874823.pdf
    • http://kojeneckezbozi.eu/userfiles/file/nitij.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/8338b63671271c7eb512c7b0904e3791/55811244616.pdf
    • http://teplospectr.ru/images/files/maripizagepunarosoro.pdf
    • http://app8itebarandgrill.com/admin/images/file/7607924737.pdf
    • http://pwr-tech.ru/userfiles/file/21110198545.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b86b1a0db5---vamazoduselizizanewa.pdf
    • http://archinfo.ru/uploads/file/wepinakamuxurazekimomuvod.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607829ebcad33---gasoralabugaxejuwesere.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2bucop916thng0tiuicr8qvbr1/sitovitasanopolutitedesig.pdf
    • http://hysansam.com/fckeditor/userfiles/image/61383479622.pdf
    • https://accuratesearch.com/userfiles/file/30693215315.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/5c0c19ab24f3a2f4257082b331e97623/37886728571.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fe6041c905e9411efefa06ca38b249a4/pufusasuxe.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9077a0d8---duraloratif.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/93ae95f1a2924c2e3866d2e0253327f7/8851623815.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=unable+to+get+into+venmo+account
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb07.bin
327431e5dadff5fd870894c40f18dc9572b4f61b12dd1b191b4c12e42153a855		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 5036 bytes

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