Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8468767c6c8493…

MALICIOUS

PDF

110.4 KB Created: 2021-09-20 13:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c160dcf43e5d2c48c52acc331fc74067 SHA-1: 79121cd6613355ae94aab7c175b02646c35a6843 SHA-256: 4b8468767c6c8493c56ea5d69fb5f0cc88b830fc386eaa412d8b93ac767ef8e0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=fear+the+walking+dead+6x6+online PDF link annotation
    • https://perfectprojects.ro/userfiles/file/78673794160.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/43214892958.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614837ca7a1ff---76955165491.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/02b6c963e11ee897aea7e7b127fa1a83/24604794438.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109121505102564.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/rujegisegilile.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/73665217204.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/dewamas.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/64609246252.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/9506403606.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/55025105745.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/89859727568.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1g06b5kfqq8qr9qi54d04ld1d5/75390719234.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/26579917683.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/5071f6e53fc0052518472239f2a14fb8/26070888721.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/rejasajekaresoda.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/1253615957.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/ravupuvibuxukus.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cd1ecdf9c2d592ce3d33c289157da5d0/19549483370.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146dcc3c7e1f---milikene.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/86430999458.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210913103237_ntkbc8.pdfIn PDF document text
    • https://sambelteri.com/contents/files/lisuxiluvovezifijepatode.pdfIn PDF document text
    • http://sinostandards.net/upload/files/19811195022.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_off00014975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14975 19040 bytes
SHA-256: 8dedfa14cce1801ffa703ce3092234e7b5289de2174061621bec491a47e5a366
font_01_sfnt_off00017b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B38 10784 bytes
SHA-256: c6575b80d86d5cccd61d377815550bf716ef8201d7a75ff887e3e6ca571921ed
font_02_sfnt_off000193dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1