Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4de39c6ee419411…

MALICIOUS

PDF

83.0 KB Created: 2021-09-16 18:10:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 27a602b98c620bec1041023cf20eead4 SHA-1: 3fb8c102f9cb048628627209c9908ec41e70f834 SHA-256: f4de39c6ee419411f56dbeaf607e4f4ab5c8f18577e30ed4a2d3f160f7aba8cf
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, including one pointing to a compromised WordPress upload storage. Heuristics indicate a link farm and a deceptive download button, suggesting the document is designed to trick users into downloading further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=blade+runner+2049+full+movie+download+in+tamil PDF link annotation
    • http://ltpbetel.ro/userfiles/file/nixewedagejoxinojama.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/dopuwamizoluzun.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/bupevizuvopevejivegojasiw.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/raseworimojorekagoba.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/16228915189.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/6966097022.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/68592320657.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/tijiwiduwafeguk.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/vomutamufikume.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/nopatiwej.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/dupok.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/iaj699ikevmk1q129pinhrhbvj/muperovaxexawejoxarolivup.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/lefefejekobipowarovuriv.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/53780276247.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/98534693617.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/mofujuw.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/belenexobowamex.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fbgg8jci3sa2tkr6tnnv9s9f79/pupaguri.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142580496340---nofufasigetilomudaveturu.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/71511185462.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/46852641288.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-3/20210903183000482531.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/rutirozipadosavufuxiviluj.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/milupape.pdfIn PDF document text
    • http://www.southpointinstitutehowrah.com/admin/uploads/file/motivuxip.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_off0000d996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 19400 bytes
SHA-256: d8be681587c0279d5ab5482283885a7fbdecf005e5f83224d82438457fe29576
font_02_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 11140 bytes
SHA-256: 59aa2cd758d7a7e356d7e0edaf009b7e43b666db5738d2ca524a0975c0fae135

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