Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9875ce9b3b967c…

MALICIOUS

PDF

85.7 KB Created: 2021-07-14 04:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 19e787e09b67ce5a9a273646f93f0626 SHA-1: 9601c401813a66dd5d85a333ea4c06965c17b35c SHA-256: df9875ce9b3b967c536a4f8786d3af8105865604953118660048a2be6a467720
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely to redirect users to phishing or malware delivery sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tucarrorentacar.co/ckfinder/userfiles/files/tewefasamovix.pdf In PDF document text
    • http://geodeslaboratori.eu/userfiles/files/27321414217.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7021db1142d3c41f359a5745fe240768/temoxirisibitafekiw.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/604dc0016f9fa67f0213339c4f9f30e5/batosifupepatepibozed.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d73703f5e77868789796aab59b675e96/lixizabuj.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a93b17aa46---36788322873.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/6e77d44fc5c47db1f08833af1f007aa6/5835776773.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xiwimakevujazebotesin.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/walekaxilisedewi.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0u5jtj4mf4rga70sav0ahls42/jugoxaketivodi.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/27169409007.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/394f00f1f3813a42fe66e71728b47109/97306751658.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e61b2b9f774790a69cf8af674fa62e43/vexoroxamowuji.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/narodiwozi.pdfIn PDF document text
    • http://veivel.com/userfiles/file/25171220412.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/suzovufofodamejux.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/177f3ef0b32d04a3bf45d4805a62dd4f/nedojo.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/jipobemufirasewikajiteb.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/9039989893.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606db2ee9d9d5---fazapuli.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd77f2777---vupizurewenativef.pdfIn PDF document text
    • http://dzbnf.com/upload/file///salejipufedow.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/63489596339.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/sizudat.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/f663174b9c72dfcfe567a5a62bf03894/49591643482.pdfIn PDF document text
    • http://kezmosas.hu/files/file/73651639457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=low+platelets+in+typhoid+feverPDF 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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 10816 bytes
SHA-256: be35b37756c7dd045aa119bed6acdf5f3e08be148a254d4671c9fb46698dea0b
font_01_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D72 16776 bytes
SHA-256: c81fa57b7475e79275139e2ba42202c1c64f3b262c437c40e71c633815c4979f