Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d25904af888e54b…

MALICIOUS

PDF

89.6 KB Created: 2021-09-06 21:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51ee81edb3fd0855931121235edbd844 SHA-1: 917a18a13d3e676dce6182c791b7008e5670de50 SHA-256: 4d25904af888e54b2037504d794e260e00d866a5dedf94acc0c9fe97ad025ef8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the structure of the PDF indicate it is designed to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://krisoc.ru/uplcv?utm_term=gestalt+approach+to+perception+pdf PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f86f24a998---6725104399.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/jevigezatibiredifudorawul.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553c8743a1---purakapusasakek.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/noxud.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/30175700020.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e922cec04f7f410f3e2e14b7efd88e98/9566761908.pdfIn PDF document text
    • http://ceroki.com/image/files/56731105628.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/xuxusitikuvelizoxiginareb.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/263659438996a7519e5849f18c9ed18d/gugiwobem.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/xizarojulesofesebekogi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/8at4o0ofvriemk8qnnutui4432/89745019844.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3te5rmn56f3tdj61j91pld8ef4/xudiligatilawaxano.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f03c2d3bc---92382302917.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983cde1d432---fofejitilutovovomawux.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/rotivimeliwixenureb.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/lanajetadunedibugiv.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents//files/worozebolixone.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa32a36fb---25883908764.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bda5713143b---66606396231.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/28338341a881e7755e00c4ed136d38df/dexexuwezukatipujev.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/jumegivubom.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_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 10756 bytes
SHA-256: 451118da78aaf40336b1c5fb4973cd894b6c8bc4416bcf1a75e37b40ec2b010f
font_02_sfnt_off00012ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA7 17776 bytes
SHA-256: b8cfbb8b5b57f4dc5742eaa2a8e977fbdf4d33209a767143cdc0b123f80fa87b

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