Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c81fed51bf41c27…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 01:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3c23a135973d315c16b8172c6a06c08 SHA-1: e62e57a535a7ae505b6d86dd03fb9110b3d17e41 SHA-256: 4c81fed51bf41c27ba012aeab5c25f2445dfcc9b0027473841a80ecd0ac02d0c
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or link to content. The ML classifier strongly flagged this PDF as malicious, suggesting it's designed to lead users to potentially harmful destinations or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a0d4aa5d0---menule.pdf In PDF document text
    • http://actlogistic.vn/upload/editor/files/18614752841.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210907201527.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5813535bf---43090958296.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109040128345188.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/gomedimexatifavisak.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f79ebef29---jumosapidutamasozubamared.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/pogako.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/l2r0i01ljqdnfv5jbgojvfhmn1/73318252250.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/pijifurovidesanasadod.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/wamuvozojufamumom.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/rejavovipibudegem.pdfIn PDF document text
    • http://specimport.by/files/files/zatezikexuzejokexu.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/73384528100.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210903_060615.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/tukosibamo.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/zavexoguwomurowidofun.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/vivijezujaluwunugobixofo.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/dozivi.pdfIn PDF document text
    • https://cmf8.ir/data/file/nugipezatuvixu.pdfIn PDF document text
    • https://mauspro.net/upload/files/68127382202.pdfIn PDF document text
    • http://pinxedien.net/upload/files/82165525362.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/sepokumonesedem.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/jesawufawuniloxixuvame.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/72490712930.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/tagisixowalasozedanoj.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab50844af---zokotogabozati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=music+stores+adelaide+near+mePDF 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_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 10624 bytes
SHA-256: 3e3888ac1d56deb7a7c3ca6a35b30e89fa4fad0709d4325b0deb481723149ff3
font_01_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 16448 bytes
SHA-256: 3080c678c6044d449e31efdf32ad77f848646f2fb345f86186bd34a5579abf24

Open this report in the interactive analyzer, or submit your own file for analysis.