Malicious PDF — malware analysis report

Static analysis result for SHA-256 59a210c9cb338398…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 01:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7b7ebf19622fa3e5d127648ef34162c SHA-1: 785adc7236a0740edf8aeb2c2cbcfabb8d6dea05 SHA-256: 59a210c9cb33839814084027d764e757dae9436f90f5d4b7de21c7d05f8f8fe0
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. It contains a link farm pointing to various PDF files hosted on potentially compromised websites, and one URL is specifically designed to lure the user into installing a browser update or extension. The presence of multiple external URIs and the 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=swap+data+from+android+to+android PDF link annotation
    • https://kalashad.com/userfiles/file/pododape.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/bokovamovox.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/42150515006.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/17649228377.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/lemamezunozimanepos.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/pufuwuritujixezokela.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/46673430231.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4005d53a---74273801638.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/98944916543.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/869c14581bf48f218771a280b49a17af/42318737792.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/42960654225.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/5291939351.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/3218539441.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ce06f6bef19d23e293d93a3b28f0f654/volufolozanunasavete.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161360d8b63bc9---rupevuginixegisa.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/12683814752.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/fakivesebopuvalebopu.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/3272723057.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/pikopadazidude.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/vagaletej.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/zawibitakinotufopebig.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/93981521303.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_off0000ca68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 10476 bytes
SHA-256: 9a5609fed605039a5f30091f8628bb30a97902b6405ea74461c864817e9b97c5
font_01_sfnt_off0000e235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE235 17388 bytes
SHA-256: 3ae8570366a384ee496776361c0bc838bf6f7c603dcc337718f5582623010123
font_02_sfnt_off00010f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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