Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba9d93e199c8c4d…

MALICIOUS

PDF

85.1 KB Created: 2021-09-23 17:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 83dbb4791490f421db47ea28e6af1302 SHA-1: 868ef7ae0c54173f8e283ef592b5485851a5a7b5 SHA-256: eba9d93e199c8c4d9922bfc4667b0e97c6a589388372b26bdbb8f7100b0feb2b
164 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vinniescustoms.com/userfiles/files/41374093209.pdf In PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/dejulu.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/gobolivebofefoxojuvalosa.pdfIn PDF document text
    • https://alpinashop.bg/files/8246853957.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/pepajigirinej.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/merogawizoziwekufane.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd32880c2f---fekem.pdfIn PDF document text
    • https://nada70.org/userfiles/file/37732770919.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/dojaxoxaga.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613163840e53b---27435752772.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/bolegikozezaliv.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/zojijobef.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614029911a013---23044722333.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbfc24383---petegulevosimofajafinovo.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/60183756329.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147a3cf9fb8d---dobegixafasupin.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/sadavugosexenarasatu.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/85701791796.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/negoruxodonenukup.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/38148807881.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/3548788165.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/54065475106.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161328faa65c61---rowatopatuwijapixaf.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/f4c27cd79f920710868281c15c832e23/ritelon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=abiotic+things+in+coral+reefsPDF 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_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 10736 bytes
SHA-256: 23e404bb0e671972b4c09d48923ad19d9387e7523533ffbe837e3d74b5274d9f
font_01_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 17572 bytes
SHA-256: f25753ad8a2873ad601ca38cfcd4dbe018185d3406f559c1721999fca4907283
font_02_sfnt_off00012ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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