Malicious PDF — malware analysis report

Static analysis result for SHA-256 2194d989bc663662…

MALICIOUS

PDF

80.2 KB Created: 2021-10-16 19:28:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e873ba42ef0c097166ba7cc53707e258 SHA-1: c3c13ca84238937e08e9e892cff63d4dabf3c908 SHA-256: 2194d989bc663662f04e62eb6b464a18138649ccf9af59b72f52898cfd5f1c53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://doanekeyes.com/userfiles/docs/80513195087.pdf In PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/40768874534.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9c7879cc---kojigen.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/9c396354a6935823cc8dd26f8d1bbe0a/sotipusajuladamoxitiluke.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/8456639368.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/vezafivaduzawane.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/jesevunurosu.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/84489662362.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021100214084973499.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/62763445332.pdfIn PDF document text
    • http://acelybio.com/upload/files/juxivikedatef.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/manedalufilavenofobupif.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/lvdo2emdrd3s2gd6bjchuko7k5/50214354833.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/xafeposofagexekijugete.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/72350039277.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/siger.pdfIn PDF document text
    • http://fatename.com/uploads/files/202110122131287060.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616aa7a17c841---16485569101.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/e68lghnkv7ej2c44l0d6armjnf/57760754035.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/82388230176.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/zivixokopemutoxu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447c9b5cd91---rusenabunemekutidibis.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/xororivigasavexexe.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/fawugib.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/dafoz.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/u-9XGpgKpwY/uplcv?utm_term=music+video+treatment+templatePDF 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_off0000d7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A3 10836 bytes
SHA-256: d8cb4f473ef7a7fc886b44dbee1aa1f3c6fcb2ca323162dd959cde0572d420d5
font_01_sfnt_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 16380 bytes
SHA-256: 25b7e92368693a67876bf9cdf46798ea4d10227ed7eec09bb38b4f2df4d3a6b3
font_02_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1