Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a92005f8b16b76d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 19:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c8d0abdd0a0578ccaa730d6f167bf548 SHA-1: 9d9628dec7f6110376987076e4b4f73ae8d19cc7 SHA-256: 0a92005f8b16b76dc410b951eb4899ff37bc027692b266d9d83a8dd15fbf53c2
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1f7e463fe---todurelevev.pdf In PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/10226699716.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c06a956be6---9038501027.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/87662820426.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/34869925367.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5f768a36bb3755f29a90e8e6a800c9db/jidoluxubajimixiri.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/jemudetubutexonilegoki.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/5715270733.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/guzeduzunipevinaxevat.pdfIn PDF document text
    • http://konberdbio.com/upload/files/87344157910.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/17137612781.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/44582456406.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/64200531614.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210903_FD29B068B32F9F0C.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/16275271600.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/37181238309.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/xosulepe.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/27188088492.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/guzuxopefiduratikisod.pdfIn PDF document text
    • http://myphamasia.net/upload/files/87239360172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=why+is+my+tablet+running+slowPDF 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_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 18548 bytes
SHA-256: dea36d7ea370eb162b3926d6bb35a943d309806d430a03fede9a2cbeb648bf0f
font_01_sfnt_off00011240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11240 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 10988 bytes
SHA-256: bae0ad6acece75c4a884cf20ce6ebac763647daa1f76ce834b3198909b12dc13