Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a2f22b74facbf7…

MALICIOUS

PDF

77.0 KB Created: 2021-09-22 09:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4942331cf1ea8948b223db51d6ac96b8 SHA-1: 095c9ada03260901f2ce94694d668aadb1aa4585 SHA-256: b5a2f22b74facbf7272f591b2c30aecbb7e216b1da6fb1d69678018fe69e827f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing malicious content or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to external sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://drafthe.ru/uplcv?utm_term=land+of+empires+mod+apk PDF link annotation
    • http://feynburg-uhren.de/uploads/66954560848.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/xozipofesozonaparotofuso.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/tudop.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/63568545067.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/46588665484.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/76302177785.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/suzazosazoxep.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/71884097916.pdfIn PDF document text
    • https://nhomphuongnam.com/upload/files/18990041591.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141378bb768b---temusef.pdfIn PDF document text
    • https://iword.de/userfiles/file/ditatud.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/jatedagusexuraz.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/70211295792.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/384aa9102789c989a2851b21dbd2e595/terijekuwegaxutaxaten.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/94712703970.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/92551897982.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210909_AEFD99FCBE98705F.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/51457511549.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f69e68d1a---75067580706.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428917c57be---72898609589.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/25780778881.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/nebobenefox.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/40434892995.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/pokawi.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/gabirodeve.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/52584286397.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_off0000c68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC68F 10564 bytes
SHA-256: 1fae02f2be4305c96ad48e1fda4268db2d90a9e13f85ad2e49f2a23887f24b21
font_01_sfnt_off0000de96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 17736 bytes
SHA-256: 9aa9d0cd5cec4efddaa46830fa136f428432a88127b6d843ca519428afe463d0