Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b6b88165142c94…

MALICIOUS

PDF

87.6 KB Created: 2021-07-02 06:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43a34c5d1608f3093996a6cdee330b07 SHA-1: 02238861b6ceeaca7f5921cfe4ebe40312198f51 SHA-256: f5b6b88165142c94dda16a9875aa4cd1499d361a630d5adcac0bfc064f9f96fd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and potentially malicious content, likely intended to trick users into downloading further payloads or revealing sensitive information. The presence of multiple external URIs and compromised CMS upload links strongly suggests a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://ketchas.ru/uplcv?utm_term=belle+collective+latrice
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/80eba2f897ba2782016134b7eaf73f65/57912007184.pdf
    • http://shiokuda1.com/contents//files/jijodafujedesefa.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/5l8afenadi6jo0lts2vhr7rct4/xiwubaja.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/78619254756.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609643eb49b3f---19155195893.pdf
    • http://hungthanhauto.com/luutru/files/39145004473.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71dda35abc---13543284213.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4abb440c9c---gadedabug.pdf
    • http://arcomproltd.com/userfiles/file/56929665547.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608649a76b134---74076235472.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2ce4d14e8---bukomodid.pdf
    • http://the100voicesofgospel.de/fichiers/newsletter/file/12601306866.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/on3uved43sk29mmgeoi30c7iu0/87614428709.pdf
    • https://bachson.net/upload/file/14862328776.pdf
    • http://zkojicin.cz/userfiles/file/66067274896.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1d29e3f8f---81572252287.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6d323aaa6a9fe204c19948db83c634cc/jisosuzuxopuveg.pdf
    • http://agnieszkapawlik.com/userfiles/file/95905097292.pdf
    • http://kistours.hu/userfiles/file/tovolijomofesivuxi.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d2d86d7ae---54242628656.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/a18f11919421fc64d5fbe7e1b1319e84/69396485877.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d2f4a534---gofulepise.pdf
    • https://protrialse.eu/files/files/27826873813.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75bbcab9d---94395144692.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd3f345e3c---makuroxurujolidoxomopofi.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/55290cced7f2459b9ec844837083d6e7/xilij.pdf
    • 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_off0000f2f6.bin
58f09866e55472c6a49f160f0a9c5d481a73adf938c108c1c7af178d1f5301f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 17932 bytes
font_01_sfnt_off00012248.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 16792 bytes
font_02_sfnt_off00013a5f.bin
11536c405e227382252ed189e1c3b92ff57260a9191547bf02fad8115924e9d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5F 10072 bytes

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