Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9190f3b021250d…

MALICIOUS

PDF

83.9 KB Created: 2021-07-05 19:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef4e426331141776e8fe67a17939bb01 SHA-1: d9703ea3cc27e25cb7da40f24f47cbbebcd571f8 SHA-256: be9190f3b021250dc5ca13ddeacce873c57ebf70e2fd1b169e6994ecfd53508b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, pointing to numerous external URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of JavaScript indicates potential for further malicious actions, such as downloading and executing additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=wheels+and+deals+cars+for+sale PDF link annotation
    • http://isvpro.com/custom/files/tapez.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/s24uvkdutu85gvso7rihst273f/rovon.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d4497673c---gomiwafarubek.pdfIn PDF document text
    • http://lawngo.net/fckfiles/ruvoxu.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/6682844696.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/gamenib.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/3276868796.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/vovudefoluxodud.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/kaxamalaxaduvugowufijo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a423b56324e---midujesotuzovegutunine.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c9d10734f926f0f68480822caf246866/vomujoreriti.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a016256146b---93062963060.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b126265ffd---nolibonubobana.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ef270b28b---dobuxuf.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/bf15ac750850c565e34ace613856552c/wenaremexixev.pdfIn PDF document text
    • https://fotokeramika.bg/userfiles/file/werojijowomukagu.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/71530335818.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e2c904a7e97cd5e536559a5f8a3c7a6d/5063080951.pdfIn PDF document text
    • http://wenxuezj.com/images/File/zewoxelozivepixejataxev.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/48921691501.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6da256990a81bd343efe17e80a7a0118/97488631867.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_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 10376 bytes
SHA-256: 17d9ecb917fcd7a4aab71bae013cb1a4b05aedb5c20cdf78afd44927af31a681
font_01_sfnt_off0000fd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD56 17204 bytes
SHA-256: 71e363f76570d1c3dc424a1dddabd9a1eff9f83c7378ba567a6df49733d31107
font_02_sfnt_off00012a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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