Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d2fe601b75f0a8…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 21:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 924bfff5e41a8ae716e0c638f3c09053 SHA-1: 6bb0bbbe40baa16916a3378916df902ec15df72d SHA-256: 69d2fe601b75f0a8ab8c3d7e7f8d3e927cf34424a25264449a52c32edcf3ea01
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or compromised CMS uploads. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious content or phishing sites. No scripts were extracted, but the PDF's nature as a link farm is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=stuck+fastboot+mode PDF link annotation
    • http://annassteen.com/ckfinder/userfiles/files/82828350646.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/duvozoxa.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/kobinaz.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/2995546869.pdfIn PDF document text
    • https://polytex.de/sites/default/files/29943985111.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5p23nhuap3gusc2socarsucl0r/nezetimulupefuroxe.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/xabawinuwerekudagubusosit.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/21912037416.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/43307094913.pdfIn PDF document text
    • https://path.mn/userfiles/files/70034914873.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/56362487559.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/tadewevez.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/golumuzuref.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/59483210644.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/rubabon.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/mudedakubobusuvajuvis.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/54510583096.pdfIn PDF document text
    • https://begili.com/uploads/image/files/mudunodozune.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4ce752dbc---90715343200.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/92860652198.pdfIn PDF document text
    • http://17njl.com/userfiles/files/52492604177.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/71248773200.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f075890f9d---sawexagotekigowake.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/fitobelubukamulil.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/bubute.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_off0000edf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 10700 bytes
SHA-256: e7d298a81ae0058525e719772b37d89fde716fcbe8f32e58be8418621c3b7323
font_02_sfnt_off00011ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBD 17276 bytes
SHA-256: 6ac6f3e6dcdff470909a791122e170527bce70d033d5070cb28e9daf31278135