Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf5d8e0fed5aee6…

MALICIOUS

PDF

73.5 KB Created: 2021-08-09 16:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 30728c28c17988aed22e39328817cce9 SHA-1: 2b2241e44b7e9c38752f87d4e0fc3c865de6633e SHA-256: 4bf5d8e0fed5aee6e03ed7ae374fd478b042166d582b573c2c62a5f1703314c6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on compromised or disposable domains. These links likely serve as lures to phishing sites or downloaders for further malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5343

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=vidmate+app+download+2018+apkpure PDF link annotation
    • http://cnex.cc/images/blog//file/82636547917.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6606f78bde---josadewula.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210530181019342649wtgbg3.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/defe67e48b71980c527aefc40b54728b/salemaw.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/64f4dce91e4ca8b34679fad410c8d7cb/kujumofavuponir.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/63306332291.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/35946699559.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/3a57c0c3b5f9ca9c71490fb35f070ba5/19436479898.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/91671750372.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff6557afda---94925862839.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/zoxamesexidimadu.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/72389449257.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/d0d89dc01830a57d93fe41e7ec24eb2c/64404788713.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/jawoxineze.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/2056eebdb3009e4e0de4a1541de5d209/xemabobafesipa.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xisif.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/mexorimurudadafelexe.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/94436052283.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/xevuxonezefonalas.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/91050975269.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/nufovimofuxedos.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2eeacea67---fudanilososipipedeni.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b2e550283---gadib.pdfIn 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_off0000c3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E1 11132 bytes
SHA-256: 8ae57cd8ac54cb349947bddfc2564e7de1de5ed9db27eeeafa53a0efebdf86b4
font_01_sfnt_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 16508 bytes
SHA-256: f0e70a7943ff71290cbb41616b1ff8c25d3a1fceae8da27ee98caa7cd9b25d97
font_02_sfnt_off000108c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1