Malicious PDF — malware analysis report

Static analysis result for SHA-256 6153be352bd728b6…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 13:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddbd4dceab941d2cb500396a7c26a0cc SHA-1: 5ac25ea38969388e57511945e13e035737a0a583 SHA-256: 6153be352bd728b6867f0af94809e73e061e70856251e68c263de62b0fe2e3b4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier strongly indicates maliciousness, and the heuristics suggest the document is designed to lure users to external sites, likely for phishing or malware delivery. The presence of embedded JavaScript indicates potential for further malicious actions beyond simple redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=gta+vc+save+game+android PDF link annotation
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/vufake.pdfIn PDF document text
    • http://parfumland.sk/upl/34674795035.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/valadomuzab.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a87f9cd5b1---5672523511.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138088eea3c5---84120627892.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/42030241402.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/9462773590.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/31643210196.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/29283535355.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/xikarimezamizizedekunulo.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/k2jp4s00lk92f10umtts0humc7/ketotamalagedupaz.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/87830419735.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/50190759792.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tepokubujilipodivad.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/dojaxav.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/637543918.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/weweve.pdfIn PDF document text
    • http://charivne.info/images/file/12862952410.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/lorigibijebajinimared.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/lunefujofuwajopalos.pdfIn PDF document text
    • http://htwy.com/upload/file/sufawanakuxoxejufiw.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/90013949590.pdfIn PDF document text
    • http://eternaseguros.net/files/files/bezigevofapamip.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/voturadumuzofim.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/15104691422.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/naxerupozafag.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_off0000cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 17860 bytes
SHA-256: aa366e588f99d939d0d2017962c35be6548480a0ab72f3bfbab215da19529def
font_02_sfnt_off00011450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 10772 bytes
SHA-256: 8d60f4e1f651f825bb1f455b1c678b5eb3ad22baecee81396056a95d6c60cbc2

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