Malicious PDF — malware analysis report

Static analysis result for SHA-256 808cfc5caf9b4780…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 01:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54f32035c7b9e0c560bd9beec59b6f8c SHA-1: 88774a43caf5e642a6855bb785aac39fc1e23e11 SHA-256: 808cfc5caf9b47800a87d7e496fbaf52a986941ba99a9d625b1c2c4d4ce50b86
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting the user to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • 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://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c968f7b5---20747518461.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/9iapn25bq4aotgbja9962oid82/pazekenejenexabuj.pdf
    • http://absolutelyneon.com/userfiles/file/nowakiduritazoranerixit.pdf
    • http://www.fonfe.com/uploads/files/36799665007.pdf
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/67900847090.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/67963062f27c68fcd938301f23148b64/10983728854.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/3030979e2eae0ef03055825ca6b164bc/71276711165.pdf
    • https://eqonetech.com/upload/userfiles/files/taboforu.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/15ab10d0c5dd52781d8fd530293fa237/85154091637.pdf
    • http://staractivecollection.com/resimler/site/files/35423309745.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/98320036469.pdf
    • http://skogsformedling.se/bilder_umeny/File/tefegakegaw.pdf
    • http://www.allatpatikapecs.hu/images/file/21336915734.pdf
    • http://email-database.info/userfiles/file/76264180899.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/durevexojelikijedagiwuwe.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/86270b176a5fb1998a532ccdb1ef5ebf/watuliraxizopopezu.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/baf931d5a8aaba42e121e671312cc3aa/20512155399.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e693a02e8e---90058253421.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/da4cb5993fd8cd8cf8a006203504c625/vevuxitegipi.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d975a8d3fc---wutematap.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2925ab9d11---91989777573.pdf
    • http://color-gateway.com/userfiles/file/35769528704.pdf
    • http://sanga.asia/userData/board/file/xufetonake.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c778fd668e3---25252721921.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/6f10d9bf0f0085e1b11e43c36de7e9e6/38855372575.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/j06f59mk5nmbcs99o55mmg1i13/81649249011.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/73487593032.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tv+14+dlv+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f306.bin
70f86c77ca192f25da594238c4408fe31b44758166ff5b3f43615200834d3daa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 17500 bytes
font_01_sfnt_off000120b8.bin
3aa7a0ea0ba8bc32b153cd320c3e49b9b765e337a8ca85c63faef393d8ad539f
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B8 10264 bytes
font_02_sfnt_off00013794.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13794 16792 bytes