Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed5e671b9413c30…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 12:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d9dfd5dc5760ecdc769a8f90e0cd93b2 SHA-1: 381880c6954f2f95f249c187c0ee8cf359be5574 SHA-256: 9ed5e671b9413c3040394e756c404cad3d9cf6b8bca3fed46c97dde417f10d4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=turbo+and+supercharger PDF link annotation
    • http://austria-ex.com/images/blog//file/wuzumesizokojasirojezozor.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/2elr64qle3oi9etdvqb93l3alf/24225977486.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/df5037806a5f3084afeea1a6e772c60e/8385212421.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/53278347236.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b75e05330---wixiradojegoro.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39d3cc726---5519985186.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb5c6d524---furodujesu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/gjr711futktstateanse8o19gh/50645797088.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/3491769002.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/fupidarivofopajul.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/g7ju653hs69dv2pd52tfhudh15/11760316448.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/65316729301.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d039822bc900b8b2edb2be2371dbfcec/1262782445.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/40b98e8c413eac31827c40fa71fa5767/renimizavepoj.pdfIn PDF document text
    • https://pellevah.com/upload/files/49455777105.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2895f0h55r8kvth5fke66ben03/nabevekoxetovegusopaduwuj.pdfIn PDF document text
    • http://giustofiori.it/file/dawovajomu.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/zaliviwebufokiluni.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/6gtnpgk51g9i5ls4o4oo9mhg93/42111193828.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/radebupagijotipuxeni.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/85567635278.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/21050550387.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/noxixopebexun.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16078cd1ed3864---kibiga.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_off0000e86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86C 29428 bytes
SHA-256: 31ed9ae93276a74334b2bb45243525d0e1b95684eb77745dace103127dfcb4c2
font_01_sfnt_off00012296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12296 10760 bytes
SHA-256: 5414026c74bd085adffaa73e14e51e430592e023131a540f9453e9edf7a12e20
font_02_sfnt_off00013acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1