Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef8c3664f35c0a9…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 02:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 84e103f0c1dd059b781662c817307f5e SHA-1: abc703a9713ac3c21771a9bed726ec002a33e507 SHA-256: 2ef8c3664f35c0a9a467b04577d2a364206361f2d6e094e371ea26057acd6456
196 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick users into installing malicious browser extensions or updates. Numerous URLs were extracted, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign.

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
  • 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://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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