Malicious PDF — malware analysis report

Static analysis result for SHA-256 285cd2c92b430f5a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-06 12:41:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25846b12b68e686c8a367b459092f0fc SHA-1: 6bc1868a1cf7397366635d3cd9eed43f1ffb94d4 SHA-256: 285cd2c92b430f5af967b76917a5cbfbe28230440205687f27fcd07d419710ea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://salt17.com/userfiles/files/sivepedazopuxagagi.pdf In PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d0v0qvkb7kh5ulteag8c8v15b0/63641117889.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f2b79398de975b6fe8367ef1698245ac/12239817494.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/ee17e585c531b206587df7cfc8aeee16/6050406724.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/49479029434.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/keriji.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987c76a47d0---95705902960.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/7tktroknjfgg98u9sutnc8ed7q/8765495731.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/berodipavipetivevuw.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/mbnd1b7nekrf1ok1i47l5cdmvm/41427349185.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/sosat.pdfIn PDF document text
    • http://guitarenko.fr/img/files/kajaruxibidafivazuvedudi.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/duvofu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/ac1356d7f4e6aecb0feaae6107fb28b4/7484191990.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/sikefazes.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/20c79a9caffe82351960d24b8393379f/tozakujozajidimuvoba.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/76916ac219509009e7cd2ec288cedd22/petuxizuxuwiro.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/falun.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/vudimusivilonujefizudit.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/51575322950.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958b6ccbc30---91664224503.pdfIn PDF document text
    • http://dzbnf.com/upload/file///vivutawo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c638cabf8---tubosusinevurazipem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=keurig+k70+repair+manualPDF 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_off0000bd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD14 17860 bytes
SHA-256: 3a78afdf20a22505bbed00d968be41447827eac483a64562dc98da930fa0b390
font_01_sfnt_off0000ebb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB7 10564 bytes
SHA-256: 7737d47be1e82ffc2b22861848c1891f0f7b3d36d87d2b3bba211ae4c531fb35
font_02_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1