Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89d07d25336f0eb…

MALICIOUS

PDF

84.9 KB Created: 2021-07-16 05:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61085becd423e7e21970e7329489f493 SHA-1: db8b0760d2f1f2ca661ab8d8b6fa9acae88ecb76 SHA-256: e89d07d25336f0ebca359b31d395470136a0139eadd152564fcae60124e5be23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through these linked resources. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=nt+scan+done+at
    • http://wib24-admin.de/uploads/file/11549930659.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ckmek9mr0463sd3h8g4513udsi/39888777153.pdf
    • https://kovtec.pl/eurostyl/photos/file/53129289188.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/19305103996.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091cc661b5fd---kobojikavowezadaj.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6fba32dc9c0a8a254cc6d6f501dc2b4e/8398318622.pdf
    • https://medius.sk/userfiles/file/xutesanafusilajurutewuwo.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bce6da04cf---rurumivufokilub.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/3497867942.pdf
    • http://vijyaiprismcrm.com/userfiles/files/sopomipupef.pdf
    • http://finalstage.biz/js/upload/files/2845805192.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5668d992---62960368409.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/93ca9ed21506176bf07be17ad0d6e647/telasidakoriga.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c08a544f55---42938948755.pdf
    • https://asthasupermarket.com/userfiles/file/vizolusud.pdf
    • http://morard-mcf.fr/data/Files/fidemaledavajogup.pdf
    • https://mimpiindahsatu.com/contents//files/sexirubofuporipofuteg.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4144213ab---82502771540.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/wuxilagidebemiterate.pdf
    • https://wagaskar.com/media/71693250111.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce19460928e---78000206986.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/95b761566e89b130c58ad2af18c6f11a/62128623181.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf22973936a---nojerodel.pdf
    • http://4bx.pl/public/file/siwirelafiw.pdf
    • http://vuason.vn/upload/files/xajadegavodujiga.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_off0000ec48.bin
3c235e34d4f5ef18fd9c295d77fa707e2dd7c2b5544a35db670cf5b3b1669043
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 16676 bytes
font_01_sfnt_off000117b7.bin
55311a8266b9041cae19335dd705b7a34283d2eb647aabff557e0f16930e1ad9
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 10100 bytes
font_02_sfnt_off00012e6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6C 16792 bytes