Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6269b71d89c068c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 18:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 93396dab64f67ace3fca5ac97fba6c5b SHA-1: 1b716e8ff421b74c845662907d8a167009b4e9ad SHA-256: e6269b71d89c068c9e70a368ca0433784ad00340ed6f6742bf9b30a02445508e
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 compromised WordPress sites. These links are likely intended to redirect users to malicious content or further stages of an attack. The ML classifier strongly indicated maliciousness, supporting the assessment of a phishing or redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082df6410494---29234419572.pdf In PDF document text
    • http://axiomestates.com/userfiles/file/labapixepemipew.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/zepegelupezupekitij.pdfIn PDF document text
    • https://advik.net/userfiles/file/18485449512.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee24f2d8ae---zavebajefajoxuliw.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/7051011512.pdfIn PDF document text
    • http://learningkey.org/userfiles/mipesetogipejozatojupejup.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088059083971---wotoxit.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/lamimeramenotukabubedi.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/vidifamatuvak.pdfIn PDF document text
    • https://ocw.tw/uploads/files/jexukumaru.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/runopuxuwijeko.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/vazuzedaruw.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/xixujekanoburemu.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/peworuraxewevereze.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/wexesazopupodeladozetuga.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/86141381837.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/93428044380.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/f5e9f1c26115387892a984afc7189586/75715169655.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/39737482896.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/94066961737.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16107363b890cc---gesolurepilopevoxazud.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/lidefokedekun.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/97718853017.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/bvjtsimh8flf9tstcdmru0tk4i/66200983422.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/neloruzabefenokopapobuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=comparative+method+linguistics+pdfPDF 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_off0000e8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DA 16928 bytes
SHA-256: c68b332d7c48edf5f5737b8c4e62f8ee07af0e03c079d516dbad20e2086ae4e0
font_01_sfnt_off000114ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 11264 bytes
SHA-256: 475f510be55958165620f1291cc47f8fa4fb57c771a52362db90cb2644e50664