Malicious PDF — malware analysis report

Static analysis result for SHA-256 64829f8d0d4b3070…

MALICIOUS

PDF

69.9 KB Created: 2021-09-02 00:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 17b9530740342c24edc73cd0421eb1f2 SHA-1: 31bc74404aef428b79b2da5440a8104d24eaeaeb SHA-256: 64829f8d0d4b307015df10a436da0c4ba6388098bdc400c6924169e1f6f7dd44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the presence of numerous URLs suggests the document is designed to redirect users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=calorimetry+1+chemsheets+answers PDF link annotation
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c9c334ab345465729b11a24bf3cb2d95/11498718392.pdfIn PDF document text
    • https://kimansion.com/uploads/file/nelasegomu.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/dofimosixuteliri.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb908080c---xatevulugasodipamubuwewas.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/rb7h1a8heq64ho4evtsntj8738/navulirunimanulowakenako.pdfIn PDF document text
    • http://stl-hk.net/userfiles/benitufarokoxejapurabu.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/6mag18314i1hfr49rkac1k4jff/xiberutonafe.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16071c55fc889b---7683992878.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/defewud.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4b7dc5f78---suwurowuxe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115c1faba482---gerazenogamituxuvatob.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b5fb43f3768---xijowelemizuxinotabixa.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0013e4f0a---23288424720.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd34d1f95---wuboxu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6b5143bc3---jobivefiwemalemoja.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/29pd6027hn53cdigse34v9t78d/13811082498.pdfIn PDF document text
    • https://bestwaynepaltrek.com/ckfinder/userfiles/files/mudutezapalu.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/99289977622.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/41262448228.pdfIn PDF document text
    • http://snft.ro/media/file/wagoginenijobojajewip.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/nugimojosedoxirute.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/buxagomizivuvikux.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_off0000b3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E8 14916 bytes
SHA-256: ebabbdf521ed8ddf6f50b513c63777692e350e34ee0ed4af5f49f5497d746307
font_01_sfnt_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 10780 bytes
SHA-256: 6e5e45cb67617b5b04ac28c0b947a41e152bbd7e47891b4e61295f182cbc9886
font_02_sfnt_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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