Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69eaa2b76d60e49…

MALICIOUS

PDF

70.8 KB Created: 2021-09-19 18:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4a2ab8e7dd09098dd92a1b7d895f60f8 SHA-1: f20f8c36f9936ef2c1c3c7d63b38706427286b71 SHA-256: d69eaa2b76d60e497a0a9765a9ff27614331c6d121b98235c3409fd76b05b515
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and acts as a link farm pointing to compromised WordPress sites. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phishing pages. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i33o8krj3mfu0ihflk1cderrhh/1682971944.pdf In PDF document text
    • http://massimosusto.eu/userfiles/files/50769856292.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/68731685249.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2d54e398---21606900797.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/50486311549.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/fawiroxego.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/rakapexud.pdfIn PDF document text
    • https://geloracinta.com/contents/files/wosuxawujed.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/95664525315.pdfIn PDF document text
    • http://ruihuitax.com/files/file/90069946403.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/duwafodisogoxifopulotez.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109180715281855.pdfIn PDF document text
    • https://phukienbep.net/media/files/12288527812.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/67930799026.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/biwomozi.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/45521277234.pdfIn PDF document text
    • https://gkatsov.com/userfiles/file/godijo.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/juwivejipupav.pdfIn PDF document text
    • http://benly-carson.com/product/files/35725512499.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/mifigevupekejorabapuj.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/biras.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/20303db8537f87d2f061cd3c856475de/positigek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mp3+ringtone+cutter+apkPDF link annotation
    • 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_off0000b3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E2 16180 bytes
SHA-256: e28e20adcf0bda5ad388f4117b40d60b7835c49509341169d826e62951c4ff15
font_01_sfnt_off0000dd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 10692 bytes
SHA-256: 07c4fec47ed60626974d1dc21900b8b0cc3d90660a32f58a8599d57b6ba70fdd