Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99741f157302257…

MALICIOUS

PDF

74.5 KB Created: 2021-09-10 20:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6f2b25fc52abf55d4b4f8fe68fa8bce SHA-1: bc1a51fe04ba11d245c8b3297e2edd2a8cf8b627 SHA-256: d99741f157302257318cb8717f45982c3fb9c15ace4a039dcb5ab344fc6c0d71
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute or redirect to malicious content. The presence of external URIs and link farms indicates an attempt to lead the user to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://daulte.ch/ckfinder/userfiles/files/10630608921.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/7edee94a44094a68b232bfce5776f735/jigamiduzusa.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/72333557467.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613069752c40b---zibalubewigusafowarax.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/rarelujije.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/dodopimonalojututibu.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/gevibonikakavitojaw.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/28512926501.pdfIn PDF document text
    • http://domario.ru/userfiles/file/kisilejumufexobev.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16131559ded792---sugenadasilox.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-6/20210906223325971286.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/l182go6lisph9ipc0j0jrqh0t4/nafofikowatefim.pdfIn PDF document text
    • http://packamate.com/userfiles/149117954.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/nixodawanu.pdfIn PDF document text
    • http://elitvorota.ru/f/file/33011826768.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/1621892194.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613193623c717---78725095318.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/jifewemu.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/jevij.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wegizazugalix.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/53534286804.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/buleguzajob.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/razobubogaguwewaras.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/gezivozevitizero.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/dubexafefabesisaverir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=cbse+class+9+science+textbookPDF 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_off0000bfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 10656 bytes
SHA-256: ca3d84eab878a6b5a76ff58d558cd4e8ec76c3c31fd10146782ad5707e203a3e
font_02_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 17288 bytes
SHA-256: aa56b1575a6efd77d684b6763cae165a9e5f4c512c14759f1b8b1fcc9e019f34

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