Malicious PDF — malware analysis report

Static analysis result for SHA-256 92515b7bded584e8…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 02:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 032d5b66390b93d7766bf6a9f62e3f4c SHA-1: 0c166607f262c1b7a2f46cd051c7c26c90d13239 SHA-256: 92515b7bded584e8365276466a5c4d522f0e3bd2249ae9c34064bd38be5811ad
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing malicious browser extensions or updates. The embedded URLs point to compromised WordPress sites and other domains, likely serving as part of the attack chain to deliver a payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://irlanc.ru/uplcv?utm_term=how+to+add+extension+in+android+chrome PDF link annotation
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb1109507---sufodibipuxupugevumiw.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135077403f66---firiniwikuredosowexunujot.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/87109820215.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/vevegivesodinumoniseduli.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/19204487905.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/83912558375.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/170334105.pdfIn PDF document text
    • https://educhina.mn/editor/files/luwebapo.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151252b1c0c5---93604999739.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/vetipabegeni.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff487c2538---40334981400.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/74491815192.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/ruzalemiwododolete.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1615389ca6444a---9068141103.pdfIn PDF document text
    • http://nessium.net/userfiles/file/kusaj.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/zamasama.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/javevivefadirobifutuwarex.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/13721304959.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee1ce38f97---disejesel.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/8a0e422413e9fc3b45d1a2e370184a6c/zifomezilix.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/salafuriwixexef.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/180506731.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_off0000b378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 10768 bytes
SHA-256: 8bdc28a9d78c9c23f50d50b1d760063af8f44b779fd332156fac22a9e82ef433
font_01_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 16420 bytes
SHA-256: 8e39333fcb0faf18fed94c09f756bb2e3f4975a9aa66cfeb81dde4a948b53680
font_02_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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