Malicious PDF — malware analysis report

Static analysis result for SHA-256 66951be7eca4f767…

MALICIOUS

PDF

87.8 KB Created: 2021-06-30 18:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df7c3f49355dbf8ada5f14647414ec07 SHA-1: b5e78107e4a9b5b187c903c85f7322fe8578577d SHA-256: 66951be7eca4f767e5dcc8fd344442bfe7551f7cff6c6c1bbf33cfccae7002e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/te3utds6elk51o5oqqtnel0jn8/19047369794.pdf
    • http://dreamcatcherltd.com/userfiles/file/tojawuzanasefi.pdf
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/51745367476.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/5ae4f6e040eba26d40b7e03a2a37b6a8/61373391705.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb018edcca4---gerezomufikafufux.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9b56ed59fc1175ffa0d8ff8528f4c32a/6768428311.pdf
    • http://nedirajtebosnu.net/userfiles/file/lezunuwulupidegalo.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/7571fc706e5726163249f09b5f6a29d6/falopokakuzewiwil.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86fe21b4e---vuxiwesolisuzirogap.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/cmlrrrj73p79m9fefj69jr2cg5/37975908814.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836f64ecd8e---tilovamokiwevijuzokoduxim.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2fc3dba14c52420fa7aebce3d2283c32/fasoxefetagadoxo.pdf
    • http://botosani.ro/img/uploads/file/gubavonogeb.pdf
    • http://php-lounge.de/userfiles/file/70679765313.pdf
    • http://matstravel.ru/userfiles/file/zuwelumowoni.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/588875f692cf996bd9a5f6aa6e7fb421/93891995670.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/443kpd9jqvvi000varspp1pknr/zunidobasegikusurufudamog.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3138e1489208ac234e92e5dc4eadb140/pomibutabeb.pdf
    • http://shreejians.com/userfiles/file/siwikozimavevubuzemik.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ce44c6330---tadagilonuwixonedit.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/oe7h2fet4n5v498uhrknqjqa1g/70936240060.pdf
    • http://hoangminhphatkorea.com/webroot/img/files/60296502805.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/xonijetatiduvapawepolu.pdf
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/9895356148.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7a5f62b96068298f9931f72b03ac259c/nabafamemufuwos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+beach+in+zambales+for+family
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f33f.bin
689359971bb4b26c7f5e98e1d060418a50394179da6ac2263396d8e63650bbb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF33F 10968 bytes
font_01_sfnt_off00010c9e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 16792 bytes
font_02_sfnt_off000124b0.bin
11acd12941d0406178f222e91ebccc82a3fa03b7a63469f5a8f988c2198bf6e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124B0 17320 bytes