Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d61066a2dbba146…

MALICIOUS

PDF

92.7 KB Created: 2021-09-22 17:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40198b1e5dd8d211447c0bd18e3f0369 SHA-1: c84508289c2a131354abd3cab785a5e2912fbe95 SHA-256: 4d61066a2dbba146d3a41c82902ff8de387fe2e80a424a6db40eee5c2073f1b6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and multiple external links, many pointing to compromised WordPress sites or disposable hosting. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates the document's purpose is to trick the user into believing there are changes to payment instructions, a common business email compromise tactic. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://chcial.ru/uplcv?utm_term=swiftkey+keyboard+download PDF link annotation
    • http://salt17.com/userfiles/files/67035173901.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/12884691625.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/xajade.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d068c06757---75815257334.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/nakadirese.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/ganemalavir.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210916155231.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/b02v8msgeaham3gnakfqgqtgq2/40699128834.pdfIn PDF document text
    • http://kezmosas.hu/files/file/kapivofumobekoxil.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/71175796950.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/tiluxi.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/65314981665.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sisudapugepagituren.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/lokoramiz.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6136e73c4b7b2.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ced1f38fd---wemawizame.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/55110685296.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/89774057707.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/70465034313.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/99771062337.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/12250012376.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/55317167492.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/06c92e39e372e7aa08d700d434cfef3f/73613964766.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_off00010638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10638 17808 bytes
SHA-256: 85c94e8329ed32b1b5e9ebb1395b911a1fac6479a2762f20db0b36f03ea372b9
font_01_sfnt_off00013482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C99 10684 bytes
SHA-256: 68414ceafc5d53a25bc8c8e7d93464b9b681e9f42afd71c6ca5c2fe9b41686ad

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