Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39da9e0a9df2333…

MALICIOUS

PDF

88.9 KB Created: 2021-07-05 00:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8eef2fbb53820a80352e26d43591cabd SHA-1: 5e0c41629f9c0c3e430998b6723bb22576727c2e SHA-256: d39da9e0a9df2333a56dd8de77887e07e1db78dc77e4c9f64bb743ce13ed7b4b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple URLs, many of which point to compromised WordPress sites hosting further PDF files. The heuristic 'SE_INVOICE_LURE' indicates the document likely uses a fake invoice or payment theme to trick the user. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pistant.ru/uplcv?utm_term=invoice+simple+cracked+apk
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d43a79884---38856080138.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02f84cdb8---96095130627.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qp214uv4tj6b21ds6angokc8a6/64436405180.pdf
    • http://k1a.ru/images/files/file/weduzatitazokibatog.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c290f9f3782---gijenorafibolaruloz.pdf
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/21815169124.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c88479e0ccd66e12195d98603ea21eba/risuwikuxowemebader.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/115227a531f1befb45cfcfa0ddc66043/lubevi.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a42fdd193e---nobavofisulonupawututa.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/53qfo8gphbd4qvapanl2e72kh4/dudos.pdf
    • http://elskenecologie.nl/files/74169316504.pdf
    • http://iaestedresden.de/userfiles/file/23551609123.pdf
    • http://docando.es/js/ckfinder/userfiles/files/melusi.pdf
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/42091876394.pdf
    • http://lammensfilip.be/uploads/files/18015030590.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/f6ca7c45d77ab5632e637d203d833cc6/dujukofifevofaw.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7d3663a1---32231162842.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f13a7a9c---4323125655.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ccd95422c---belotid.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/57dd9c01e8b3418fd44ac0270806da3d/38385303725.pdf
    • http://zatoodesign.com/userfiles/files/38631050595.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/032d24f5df426bcbd0f4be082a97839e/65051199051.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18e.bin
79557d9b0ea4df0f511759b4af4e16140351a09bf0dca389152ad992676902e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 10684 bytes
font_01_sfnt_off0000f9fb.bin
4a8d3e681b7141eb3342423641bc1ccce675a37e953ca45175b7143c665a45e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 17588 bytes
font_02_sfnt_off0001283f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1283F 16792 bytes
font_03_sfnt_off00014050.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14050 16164 bytes

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