Malicious PDF — malware analysis report

Static analysis result for SHA-256 85181301d5bb40bb…

MALICIOUS

PDF

73.7 KB Created: 2021-08-13 10:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcdb7ac67116232b0b02238f7b28ab12 SHA-1: 001729049695fc6ab7c09bdad3f68164b749524c SHA-256: 85181301d5bb40bbf8a2597cb9f07a1f1c10f451d15917f72a49ad2cff2f5a5d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and compromised CMS upload links points towards an attempt to exploit user trust and deliver payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://garglob.ru/uplcv?utm_term=beyblade+burst+god+episode+16 PDF link annotation
    • https://penzionradvanice.cz/res/file/15594157034.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceb8b95579---tozufariwaje.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ab88dc27f2796d8d37c59b67ee8f7a2a/67622386867.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/2dd2965a4a1384177825333a76b11e2e/xavexivojum.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/11308617700.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/mejevolapu.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/vo8v9b2os5t10aadf8kdtnno6q/jabakozafalusilemafom.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cb5b16596---13237323477.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/23461391928.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9a72b23f2---77692702010.pdfIn PDF document text
    • http://jmyhship.com//uploadfile/files/89004388565.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072720a18ef8---sulugesojitat.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/99341077760.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c2f8df34---67166728856.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/gatawevorotumosogew.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/30660416189.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a57bbbf7a---foveponuxasujukilepik.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/pafuzibidifunali.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/29032165064.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/rowirurejetad.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f97bd9c1a21---vitared.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/87715669786.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/8739u1sopdggqr8t7dtps35hf6/mosidikopefesedaberaj.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/xopekixima.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_off0000be4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4F 11088 bytes
SHA-256: 3dcd2be5beee1cd80c7d5ad9ab9fc6b2d413387a6e441524ca61463b6e69828e
font_01_sfnt_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 15892 bytes
SHA-256: 60a2132db0b367fa84fa17648a90f5f97a65eb8f6ae3257496ba39f470360390
font_02_sfnt_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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