Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a825df735528f1…

MALICIOUS

PDF

72.3 KB Created: 2021-06-08 05:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3deb46748c3a784812b29a41cd5eefa2 SHA-1: da2e8ea86f0d6e386be75d77d1bd07f91ff3ff08 SHA-256: d8a825df735528f114f8af7d32a06055c2518d9f18855598860ff44d56e5e334
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pixomot.ru/uplcv?utm_term=termodinamica+kenneth+wark+pdf+descargar
    • https://ev-owners.jp/userfiles//files/48018147596.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082583187ff3---88566105209.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/dfd18f5f96d464b706f623ba2b8d50b6/faxujizidixikanokujejewa.pdf
    • https://topclassgreenery.nl/images/file/nawuxi.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/heh2e10e8lub679iqriv4kdsdc/89795268135.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e176aeb2e1---beragufanosas.pdf
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/bd1ba7cddcb3f22ae71d595196c06773/jemuwulekutat.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/2a1d6516592ef938e4831f9be23c1a02/95353244131.pdf
    • http://www.aportecnica.com/imagenes/editor/file/rufawexekatukutave.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b42f325d6---5792556508.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n6enagk26lun1t47gkfahl05d7/tanufek.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609807d438924---24302519893.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/ca883eb169a5482a327135a074d159e3/lumurikuzugis.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/2554b0ed91d07e1a42ed2152b22ad05d/simiva.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/5lka5kkcnqsvs5s6l5eet9jj54/48614917373.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/3e1c50c3fb2c38ceed6c2a74ab69b583/tinesimudirefiwutegali.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a347deefb96---toduwanana.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc00.bin
d7f0db51dd99bce031949fced33c2d49df9156b9c79442f9d11f9a6986a24097		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 5644 bytes
font_01_sfnt_off0000ef19.bin
6b1a9a8d578ca032764e828638e78513d9ebf23141de3f62c23a7b5dc8dbfc4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 11444 bytes

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