Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e3fe825a13f554…

MALICIOUS

PDF

87.7 KB Created: 2021-09-07 04:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 55c2bafc94601a14f995dabc2674ca30 SHA-1: bf0e067002e2a98afc4d1cf85361b7ccf94292c3 SHA-256: 28e3fe825a13f554045b66cba2f4dfbf377969f4a201a9cbb88cac4c7ece1439
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://jsdarvin.com/files/wizabo.pdf In PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/a56c7su90kubhegvqri4etotdd/degekuwonup.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/59218080964.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/rugajotalurudotirolibibov.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/jokomemekuz.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/pogoxinaluroragosodakabu.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e29d3905bc0530ffb61208df5faef7c9/44397054066.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/xewofazasanibud.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/badikobojemuniwalubokuvis.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1875e0495dfeba77137dddae6e1451b5/2135129856.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/45371077021.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077669fae115---88361278660.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/bafej.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/50033771210.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/7824aa9d66c02e0ffe2583d7d0925cf4/dikelonipoku.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/87c26fb1e1ddb86b57e5949647d44183/wokegidaliwaruw.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa3a66ef2---lopetu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/tc3bn3oo17ai4fev15ia8oigta/12472155625.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/geviwudijof.pdfIn PDF document text
    • https://isitekmuhendislik.com/userfiles/file/lusanorufaka.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1611eab24d1291---18275289069.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ddsgk43ajg01k7escjqd84a281/lujibomused.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776cce3ac82---witozefivupo.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/27297096370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=microsoft+power+query+tutorial+pdfPDF 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_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 10948 bytes
SHA-256: e3d65d211dbc5b36ec96116315da7c96294985f33a897c74e375e7de630475d7
font_01_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 17644 bytes
SHA-256: 8f30840c0f664442da28dd31a982e5f1e3c66d8fe34bf5ebef121e99206e40b3

Open this report in the interactive analyzer, or submit your own file for analysis.