Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee39e6ace8b02e1c…

MALICIOUS

PDF

78.8 KB Created: 2021-09-22 10:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e95837d9ea4bb59d37a6f7d6f068764d SHA-1: 38aa6b21f437c7b8e148a8057df6fcce180deb57 SHA-256: ee39e6ace8b02e1c71bc8f71d519ea8539550eaefce517c3ddec0d5d7068ed2d
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's designed to redirect users, likely to malicious content or for SEO manipulation. No scripts were extracted, but the structure and URL patterns suggest a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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://privatecambodiatour.com/userfiles/file/kejipelafemupemep.pdf In PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acce390359---revulekasawexas.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/pevobeve.pdfIn PDF document text
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/sewexovejafasosusavado.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/kizuloj.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/vasipexogazigisafivozado.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/taxetojabasa.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75060323912.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/fotuxilezobaruzolokatonu.pdfIn PDF document text
    • http://santabruna.cl/upload/file/53253126374.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/ecc625a67652b28b3d42489927658bd0/97154115502.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/55895a9a2d8db77b755b7df3daf9e89b/63011645154.pdfIn PDF document text
    • http://bresky.cz/res/file/14182102817.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/rejojuge.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/nikulugategunalagilexif.pdfIn PDF document text
    • https://interconformity.ro/images/file/farudogesed.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/kezerujemujofen.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/93686766922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+install+kodi+18.9+on+android+boxPDF 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_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 17800 bytes
SHA-256: e8b8edc23c0146a4c2d57a2c1dab441e6515a0850da289c54ea2b3aeb4b4cef4
font_01_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 11016 bytes
SHA-256: 0e62c2e389c53b90e6da1e700f586b5abacbb2d75785c6ea6a682d5652070a5c
font_02_sfnt_off00011625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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