Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ceafb5b27fc8b3a…

MALICIOUS

PDF

96.1 KB Created: 2021-07-01 11:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3eb9dc13d7c1f82aeac40cf68f473695 SHA-1: ba148a6604b116ad27cbba852598155601fc9e4a SHA-256: 4ceafb5b27fc8b3af067dceab589b0f7991bf385a61bdd591efd27856e5035b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or leading users to phishing pages. The file's structure as a link farm is a common tactic for evading initial detection and spreading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://medvor.ru/uplcv?utm_term=catherine+bell+ever+nude PDF link annotation
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/9d2ee05630b799e3378dd6dab32ebb91/59458529589.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/relos.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160750315d97da---24777812619.pdfIn PDF document text
    • http://www.asslar.de/downloads/xawexepurudipidoxetesew.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f1f847065b9ca2a0d59fdf6b515457a8/wogujozirusarasemowimupe.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/63318934369.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9cc2af3ed8cca5df3b0d8b3da249bb53/gugipugunelawu.pdfIn PDF document text
    • http://bronia.org/userfiles/file/19418609210.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770046656cc---46878958932.pdfIn PDF document text
    • http://nktrading.qa/file/files/63627488760.pdfIn PDF document text
    • http://namngonviet.com/user-/files/lexef.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/tagukil.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608048f116da3---17880702550.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/xusuriwijijoxatexurofel.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/33889046843.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/99008182931.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/mejimasekunikiferu.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/wulivisusurojomijafewoli.pdfIn PDF document text
    • https://dineflon.com//files/26037351087.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/144ad52a435c11b81a5cb9b389c90d00/misijilazazetewikukujafa.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/17429504303.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/49312414439.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/jigcorlr2nb8i75vsslst7hp2j/20611374532.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a8dac1bad---mewotisavom.pdfIn PDF document text
    • https://castel.ro/userfiles/file/57796295014.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_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 10392 bytes
SHA-256: 79a7de5757dd2b768f1a9dd02d32f80ead47164f1a59255b5e71f609e5fac2d8
font_01_sfnt_off00012de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 17388 bytes
SHA-256: 19af665d62064944141f17bd9679223995fb9cc59b33fe7ce7a733004e849ae3
font_02_sfnt_off00015b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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