Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd489a6d2910d0e2…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 21:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ac6233676d4040295a94a856c658b9ea SHA-1: 3f255b4d97d76ce8ecc24715dc0397cdaf713f68 SHA-256: fd489a6d2910d0e2682b60baaeedefb082575f631212b27a8f9f58b3e7047f2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly imply it's designed to exploit users by directing them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://garglob.ru/uplcv?utm_term=cut+finger+while+cutting+raw+chicken PDF link annotation
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/85dc7e84abe1109cdba27cc4549aa246/rusuxotixosuxokugiligikib.pdfIn PDF document text
    • http://mamam.by/upload/File/file/zapobijore.pdfIn PDF document text
    • http://timebymtm.com/upload/files/zovowudakimaweki.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/50058249591.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/mimuvixonitorebedivet.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109081116049467.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/31914482931.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/59459219463.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/bepijuvazesoxo.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/mapiziw.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/99839782015.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/64056155156.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/xexozadifazenizevegunud.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/91138716511.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/40369894902.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/16088529252.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/18542454351.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/10637391488.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/cd274f16fe1c471417ac3b529ed50ec1/niwonowolapelezime.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/70937767261.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1615137a4e1e5b---nevamawususu.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/kuneres.pdfIn PDF document text
    • https://interconformity.ro/images/file/lolozilinok.pdfIn PDF document text
    • http://rsentco.com/upload/file/3064964187.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/nj8kufdsf84hirnahojs9lcg98/61609402332.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/gezanagukapupedono.pdfIn PDF document text
    • https://abcspain.tansis.com/userfiles/file/fumaxozoneladom.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_off0000b280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 10636 bytes
SHA-256: fae6b7e7359051b3d2af51959ef42e0d38fb95c5f2ed21bd2764dca2f356a103
font_01_sfnt_off0000cad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 14604 bytes
SHA-256: 92cc943e6936e254348c6a47caa791e7c020bd5e0063a120598585f8efac923b

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