Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e49fbe39144d40e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 02:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f44ea47bc9c95caeddd0005002b2fe53 SHA-1: 3a4fdd3b140f82378ca68a085b7b872777ed8382 SHA-256: 7e49fbe39144d40e935e5b6bf3deb34440ec8182ecab95c862b49be49bd33581
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to manipulate search engine results or redirect users to malicious content. The embedded JavaScript, while not fully analyzed due to obfuscation, is a common vector for further exploitation. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=avatar+the+last+airbender+role+playing+game PDF link annotation
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/94bd9d54ae625f958068b4aff56d7e84/xirofemir.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5dbfee663---latekuselekofep.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/tr7tkhhiprtrdkvjnbfre92lj4/24768176654.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9bad469ef---bewizizu.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796c3eb663d---92419693548.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4d4c5f06eced79d4722aa7ecdb5dec28/85767656206.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/k0icr0pagf90k6hg7qip9ht16l/pisixopizaniputa.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/32309946781.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/6bc4e5c3de867be0e6f48feb1cb677a5/buzumirorisojepubavaxere.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/berupejubajuguguf.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/97588867588.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/11509935485.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077bf0ebfcb1---21275998684.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/gsitk3k1r48kktusqkt89v2ppm/43110650901.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/maluko.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/zidofokezozorike.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/55430408457.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b285cc0d88f---65729621371.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/nenisakejojaxiw.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/ridina.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/8839057759.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc557b0f56---5176063014.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/57390872939.pdfIn PDF document text
    • 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_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 16528 bytes
SHA-256: f1a7f13f0d8ab093f7232e6cb1f392548cec336861d7a5672651f8900114b362
font_02_sfnt_off000117c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C6 11140 bytes
SHA-256: f6eb6e66ff4220cc5f555a4821cce8a56a3bdc310ef163726c114e5da6b91546

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