Malicious PDF — malware analysis report

Static analysis result for SHA-256 0461effe82905da5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 13:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e172b4a641ecf1b0265d5ff0f5d06ed SHA-1: b2b543ef431c7f295bfc79091e9ad012dc7bc823 SHA-256: 0461effe82905da5a645d8889bf32a019d50796b3c411c7a3a00f2bd289aa54e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL analysis point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339fa49304e---25733247249.pdf In PDF document text
    • http://soldearenales.com/galeria/files/18506370015.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161463abb7eee2---norat.pdfIn PDF document text
    • https://mihalex.by/files/files/solikos.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/84426209913.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/52357580254.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/79555685671.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/13825502402.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/69883688000.pdfIn PDF document text
    • http://axwelindia.com/uploads/rutajareraten.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109160216324224.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/zowotuso.pdfIn PDF document text
    • http://boardmark.com/files/file/zebadifojetixijelukosu.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/zejovijowen.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/taretisudinubuxopag.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/zerelavojotif.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/90539862988.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/76007146429.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/jatedinunizeguwawo.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8d3df1f0b00a17f1dd064ec3ef893e3b/wugezat.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/beletumojepudux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=convert+330+degrees+to+radian+measure+in+terms+of+piPDF 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_off0000ca07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA07 18244 bytes
SHA-256: 8d3d612491e286e80fe00e29b97ad717412ad936d5a0e2e8281b8b6014b47d22
font_01_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 11288 bytes
SHA-256: c1a63d6ae9331f7dfaa98a1f27755d94bc2af10a77c459c4b17aeb1aeee0603e
font_02_sfnt_off00011438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1