Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc59792bf27ce14e…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 15:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e076ee0cb54736f945872be21ab52dd SHA-1: 6925c03b506bc6acedb21d823964b949dea05278 SHA-256: bc59792bf27ce14eee3ad8e9a544503ec2e016249ddeea2db7a0da3cb170367f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=eagle+dental+software+manual PDF link annotation
    • http://yilip.net/userData/board/file/bororafifadovijirekinoba.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc73e1bf6f9---zaxawuzaf.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/konelex.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/jewub.pdfIn PDF document text
    • http://bollywoodsalonskokie.com/admin/images/file/85059725188.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/dowuvodarudajoz.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/rolumebizawumuwavofaxeme.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f446f6b7a391ec852a97378b4499b2ed/59511305084.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/puxekef.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/46518887956.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c2148a532---27877213756.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/gijavekevajezo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b338155b26---lerutidekuzoreninarawame.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/395269fb04e5132fba1d4b9aaa5a0c61/gomijobafezepotuji.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/ronabozivumokip.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/61009633157.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/jif5gb9j344qhp2tci79tb0ipg/nafojurikivavus.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/tuvijusapapevupolatoret.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8468f2c03d---95525388471.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/135c0c55f4e572e4542b4ac3116fb7ee/xubamerupofegozetoj.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fc2b34dd---1534915613.pdfIn PDF document text
    • https://mauspro.net/upload/files/burotofilinalobamopezin.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/kudodivulaxavipewitexe.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/16315338104.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_off0000d9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DD 18376 bytes
SHA-256: 05d985e7b0b86f62e7d4cbe5728c4daf4950c1dbb9c793dc2aaab38a7939c4af
font_01_sfnt_off0001092e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092E 10772 bytes
SHA-256: 5f6cbbb51e34edf2b3f38ad7c53623eda1d40fbabd5c85379c17edc0e031eaa1
font_02_sfnt_off000121e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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