Malicious PDF — malware analysis report

Static analysis result for SHA-256 d469f81729f3164f…

MALICIOUS

PDF

96.0 KB Created: 2021-09-04 10:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 06a7453881d509a86f92f4031176f232 SHA-1: 13307df602a976311dbdec05ad3c0fe725a5de21 SHA-256: d469f81729f3164fc99364ae14cf1404d713b1e84f7177a7c0774dbe32be0f15
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded URLs align with common tactics for luring users into malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a85f3a209---35427203600.pdf In PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f174d5476---20048435194.pdfIn PDF document text
    • http://erex.hu/upload/file/39930004922.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/45351280155.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9efdba92127d759600ba85949722d9e9/nuxoladu.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/64780801678.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/pifuxadowujebemadod.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/gukede.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/55972749117.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/gijojuz.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/fajasodezijilubaxukexeb.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/falakixa.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7d383df150b0bf549e18e971f8a0ccc5/viratutenanawelujegag.pdfIn PDF document text
    • http://webs123.com/userfiles/file/kitujikalujud.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/dotowe.pdfIn PDF document text
    • https://duvanco.be/docs/files/sedizutavegowuluwit.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/nozumavuliwavumusufabog.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/is9kfg7pbbjnv46ga81nug65ac/66246927650.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/85845505580.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/68872439176.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mkqh25clen1bl3rhq4s078uf36/29789478511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=accounting+research+paper+pdf+philippinesPDF 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_off0001124c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124C 10980 bytes
SHA-256: ff45f2235c9687111cb2e2c361f6edc45e0e527b8279b3388e39f754f5290f85
font_01_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 18176 bytes
SHA-256: ab5b69b0063de7e46cb3ddaa6386769157c359cf8348ace8ef377ef009c120fa
font_02_sfnt_off00015aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1