Malicious PDF — malware analysis report

Static analysis result for SHA-256 827adf9b78c667f7…

MALICIOUS

PDF

100.7 KB Created: 2021-07-27 19:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a71014458c811a3751414e0a1f2ed0b2 SHA-1: 5a6dc59dc2e8db004ec5cc3d7676bee6b91f5f06 SHA-256: 827adf9b78c667f7fd3fb0eb183116a08fc2d6c360fe09bd5b8832f2c5f0fa27
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristics suggest the document functions as a link farm, likely to redirect users to malicious content or for SEO abuse. No specific script functionality could be confidently determined due to obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/borugakijarosowixuzivoxo.pdf In PDF document text
    • http://ufnk.fr/app/webroot/files/file/lodoji.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/28ef97c490d62ccf71c9a298ac37a5ef/roladedipop.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079448f1a860---zurojerurobegujepub.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/linimaraj.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/739d1c3ddbac6c6a9151e5beee7ea86a/83213500383.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/3922310901.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c728260fa---96443843805.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ed1c0ed98---11670599629.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7a47c96a6---93542472360.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d98c48e4014---33982141058.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/38435929941.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c925710b181---72256396545.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f8564052e---tomusomalosoliruzoxugixik.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3d1fd1046---sanewolise.pdfIn PDF document text
    • http://abnicum.ru/files/file/notuluxudijopepikijorut.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af6b5a2d5c3---jakopudetusoratapugunitu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608db09f0da76---kaved.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/36043096274.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/94304019298.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9ae56d099---80944004624.pdfIn PDF document text
    • http://indel.sk/userfiles/file/21178419305.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609187cd3b0f2---40725982881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=divinity+original+sin+2+starting+character+build+guidePDF 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_off000125aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AA 11188 bytes
SHA-256: cd9248b37a07681f27e4ab504a101b2881c83192ba1dc198db4f13268841afd0
font_01_sfnt_off00013fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA9 16284 bytes
SHA-256: a22db2f5a1e08c1cbfb301b967aa90fc9793419b1722df69cf36fce3088cee3c
font_02_sfnt_off000169d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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