Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8222c02d1d0bf51…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 06:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0516ae642cb5e7a37a3c7cd3686ea7d4 SHA-1: 6873b797701fe46e849db8757549ade138fa81d5 SHA-256: c8222c02d1d0bf5154eacfc82f618953b62269086d4ecc9c9bca82ea5cf716b6
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to redirect users to potentially harmful content. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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://pixomot.ru/uplcv?utm_term=golgi+type+1+and+2+neurons PDF link annotation
    • https://aartipalette.com/userfiles/file/84587732800.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5a5b7020d9af748458dcca937b8b4623/famudume.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/kavusekozefujafudokil.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/8a03b145cbc88c78a5c3e3cfa7362ee9/vefat.pdfIn PDF document text
    • https://somogyplusz.hu/files/dedemixidubisatijewazawuf.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6835cb45d0b13d4bb4ee57b7e252b4fb/zasurimuvosupanikek.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/lixurakuvogutot.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/22ba4155b6d3c04d971f5849671b63a1/66460592330.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/lipivavixus.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/cc1lsrp5qhum02kejtchjh0c9o/61002407959.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d071f78921e---11737453335.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/95865831821.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/21979691664.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/kazofuruk.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a66e8e40010---42036273843.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/d89579f3836ccebb0699a1376ddd5e16/80216398048.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a3658ed08247597cc62a8cc5ebd407e7/21284587066.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f01fbcd97c---sisamebijize.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/pelakapelimesoropanob.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cca1c11e3b3---31111668725.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7r7dthnf8vimribssqv4lh2vm8/89569762914.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b23c6e20565e1c31c25699191b9afeb5/desalubuwefejanekawe.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/12595541382.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000bb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9D 10992 bytes
SHA-256: b8025738977163fce050665bfaf0a12b870be553e12aaaaa560da324e5b058e6
font_01_sfnt_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 15980 bytes
SHA-256: 9c0d50fece8be37ed7f765796b73fbd59f58bc9105878899bf02892b4251f4ee

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