Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a334358a5982f0a…

MALICIOUS

PDF

98.5 KB Created: 2021-06-27 02:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 441629086913f7c8781754db7858432c SHA-1: 7afdc2495c2cc76c9e72a14fadc19c954165dc72 SHA-256: 7a334358a5982f0ac40359f405f156c68171cfb1fed05e24c837d7f7b42f949d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the heuristic firings point to a phishing or content-distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://crysiq.ru/uplcv?utm_term=technology+and+inequality
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e2aa3157---61823777578.pdf
    • http://15fratrowreunion.com/clients/2/2b/2b18ccadde375fd95e9ac2d5db5aaa67/File/8469137450.pdf
    • http://foodchemsino.com/d/files/vujevevosu.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fdb2b000---nawesokakubezebomila.pdf
    • http://jiuxingchaoshi.com/uploads/file/110143507320.pdf
    • https://mariellatriolo.it/public/file/levin.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9822f60f7491af29c5a6a967c3666e6b/majavepedaxinemutaf.pdf
    • http://alphasigmaoverseas.com/userfiles/file/95074010874.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/2bdde268224365d0d4f364eeb469bf71/10594486083.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d711add1f---tugofutotobidizedalos.pdf
    • http://namlongprojects.com/images/uploads/files/xigewipigorereroxufo.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/g7vk3e71ftd91mpcglle0dgkp0/66502821237.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/dikoxakudinubisulexuj.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/raeabuo0mdf83liafqvnan2dsp/gimalibidiwana.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/80979263386.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/17fd3e86a95416709cd68d69de6f35a5/96736557810.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//63446915099.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/91451baaf8329b585bca786b5326a4e9/tolujaxadewujenepobuwule.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/deejcrv7ovp5jhb1dbecfl28uq/95609673419.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jp7mavfdjk80mfj2ala47vndnk/rawagapexatoniru.pdf
    • http://alemotta.com/resources/original/file/bopup.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_off00011fe9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE9 16792 bytes
font_01_sfnt_off000137fb.bin
41b638199b882f47f313bc26bd77889d13843f0c5209ab9aa3fa5f343bd326d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x137FB 17172 bytes
font_02_sfnt_off0001650f.bin
6b461cb45987753fab4c539df1ac7a0ec4f9fbe0ba01d20d2f1b9383dbed1f0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1650F 10704 bytes