Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3cd79f90b528cf4…

MALICIOUS

PDF

72.2 KB Created: 2021-10-04 09:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: afd08b4dc6c7fba29a12e85e39a6312c SHA-1: 753e869e13c8a7ec235db36221f77d282f84e8bb SHA-256: d3cd79f90b528cf487a0f34173cbd97faf8a6a1dbdb9bda0bb21e4c3e0f2d549
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised or disposable hosting domains, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mygotour.com/FileData/ckfinder/files/20210904_0C631CB55BF5D4DD.pdf In PDF document text
    • https://baatco.com/ckfinder/userfiles/files/8284783899.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/8b0800668b832a1b4662931b0aeda2b2/korovisofavir.pdfIn PDF document text
    • https://drgcode.managenet.ro/images/file/71653923911.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/22295898286.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/14271769021.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/jakajebu.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cbcab0c5f041e1c864b219682d6fd872/65466084317.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/xorama.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/roranevova.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614bac57914db---26767223068.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109092129248599.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/sizawuz.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/lorumapeme.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/87808350123.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148cf13f20af---938208685.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/topidifowozosabarosaxapat.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dilezejeditawut.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615699eb80ba0---zidalezan.pdfIn PDF document text
    • http://remobudostol.pl/pliki/julatidelepopopepamixu.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/89892893734.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/84190697971.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/pojujupamotulofogud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=nutritional+value+of+oats+per+100gPDF 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_off0000b27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA92 10848 bytes
SHA-256: f82f35b206a3c8915618bf0a688af3e1738572034d4f138bf11521fc625e46fc
font_02_sfnt_off0000e3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D2 18356 bytes
SHA-256: 38a9d58a61a84b9839d41bec48b6a0e66c96d1eb5c224299ba45dc760958312b

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