Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef28e75986c5818d…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 14:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b2c363df6fbe4533806a1db5599699f9 SHA-1: f2fe63de657a85fc01c6b6e5b2aabc844cc797c9 SHA-256: ef28e75986c5818d697d1b03c510887cada36abfe0ce54a5ed059dbc4878cde0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on various domains, many of which appear to be disposable or compromised. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links for SEO manipulation, likely to distribute malicious content. The ML classifier strongly flags this PDF as malicious, suggesting it's designed to deliver further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://easy2ticket.com/upload/files/soxejame.pdf In PDF document text
    • http://chongqinghaohong.com/upload/files/jepakodefemub.pdfIn PDF document text
    • http://toonesk.com/upload/dopujadabejala.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/talelokexitaxasebalug.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/4479177958.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378740d8385---fezisiwewatoku.pdfIn PDF document text
    • https://thepainter.asia/upload/files/94717200064.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/tajurubilowujise.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/zuberoradusituxoma.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/071943491104.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/61640962623.pdfIn PDF document text
    • http://potlista.com/file/files/rixizazemipivojuzizep.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16133582f719ce---27830922700.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/53706322892.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130e0b7dd3a0---xixetuxav.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/26362643350.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/67121399722.pdfIn PDF document text
    • https://turbooto.vn/upload/files/88369070947.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/51712108771.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/gk6r9jfccug5di5op6j45o3n79/kenuzenobowisesokope.pdfIn PDF document text
    • https://manenshop.com/upload/files/dinuluturagazedirazumaje.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136805ff118f---20994505744.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/miwoxasomopiro.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6dbd1f7a5---dojofewutesafejuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=harry+potter+and+chamber+of+secrets+full+movie+downloadPDF 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_off0000eced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 17952 bytes
SHA-256: 7da8bbf5bf340be9ce1af4f5c5f651d282a42a2a1b89d8db5c7520a706bcdc70
font_01_sfnt_off00011bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D8 11380 bytes
SHA-256: aaa8fefbe714e5d386095d4e090115e0cbdfc1ccd6178155934d7e5bc2188ca3

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