Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ca1e29f0443275…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 14:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f699d50a248d88e9a73bb199582ffb4a SHA-1: d17589b7afcbda82e523658a6c3e559a8ece6c41 SHA-256: d9ca1e29f0443275e9c79386ebb289ec5ffd52522844eccbb3adb2d9a738abd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. The embedded JavaScript, while not fully analyzed due to potential obfuscation, is a common vector for further exploitation in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=advanced+engineering+mathematics+with+matlab+pdf PDF link annotation
    • https://limsurdua.com/contents/files/xufuwapubusinarumaj.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202109/file/2109061723094912865nsppusuc3hi.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/sonunipesinujesebomiwo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/2aa3df93d36b545efb616f03444a3e4f/kaferirarovil.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/2338015107.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/woxesokirav.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/niwepove.pdfIn PDF document text
    • http://camara.acessoainformacao.org/uploads/ckfinder/files/dijab.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/7987419707.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56114793667.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d243d3f8---zopokod.pdfIn PDF document text
    • https://profesa.net/userFilesfile/29274833321.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/gunesivuxojojawumigu.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/xemefevotuzoruwewodin.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/xipegiregomotewumetazezet.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/73261297897.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/89412777815.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/metikikunotipuwimixezotep.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/178a221689af38c0d211684a70b91683/telezimolivawi.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/64119027409.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/50744674551.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/fokil.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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 17568 bytes
SHA-256: dcf81a79080cfdef1f487b865d192c0f0b04e198d8e7c57c471c0fc457f56ca4
font_01_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 11220 bytes
SHA-256: 5e409f1d2fc48fb2b8faa086edf96b15258554be9fb1c9ecb7b04fff2fb24747
font_02_sfnt_off00011fc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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