Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f1d2e817d4b9e0…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 17:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c9f081c29e07b20f5dfbee6dc01b6f7a SHA-1: a7cde516fb8ddf3c0ddfaa387d4d1d7774d0735e SHA-256: c9f1d2e817d4b9e09ef58890606420d8b9eed72d2a190af76da1b7f31841f185
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised CMS uploads and disposable domains, aiming to redirect users to download files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://comtraining.cl/userfiles/files/fopilukuge.pdf In PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/wobagevejafadivaxo.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/xinolorekegus.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/73877000520.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/60878665681.pdfIn PDF document text
    • https://clinicscrm.com/img/files/banobex.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/julezobela.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a7c9f685---puzuzofonoxeto.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/95641347619.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210909_1819BBA51504541B.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/wakapukafusaripifas.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/sepujoxixogux.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/bizewaxepu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c0ab7f4c6---22752699899.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/73441833868.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/matitirodogunabipagevo.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210909033827.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/89770392144.pdfIn PDF document text
    • http://airzo.net/userData/board/file/73072808192.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/698e1eb209816d84dd8f96f5dd924ed9/tuwiduruzaluxikona.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/maxegubokap.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342f1a85336---21744064090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+fnaf+world+for+androidPDF 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_off0000d160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD160 10036 bytes
SHA-256: fff0bc292b669a34ef7e6f8a31326e6b72a80a9e11a501eac9ec4f037178a058
font_01_sfnt_off0000e7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B6 16600 bytes
SHA-256: b1e601bd414559ba92a851ba0368ecd615bfb36df909562b7bd102884fb30091
font_02_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1