Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4d02f7d6899fe34…

MALICIOUS

PDF

73.2 KB Created: 2021-09-01 06:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e773d54a6a4b4983a1be568a427e7db6 SHA-1: e16ea24319dd992cd8bf684736a9cb28423c1987 SHA-256: d4d02f7d6899fe34fd84a2c59341188979c28c7e0d3cb01dcbd233c81b11bebc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external links, many pointing to compromised CMS uploads or disposable hosting, strongly indicates a malicious intent, likely phishing or redirection. The ClamAV detection and ML classifier further support this assessment. The embedded JavaScript is likely used to facilitate malicious actions or redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://inwebjor.ru/uplcv?utm_term=business+car+purchase+tax+deduction PDF link annotation
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/vujeluwumoxubuzar.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/50130262620.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161192ee7ea479---8808206599.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611044722c7fd---nagomelaweko.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/moxiwulegin.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/24529855782.pdfIn PDF document text
    • http://tingyi-bnb.com/CKEdit/upload/files/xojusilonemegebasar.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/27981537723.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5213008c1---sinutuj.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/natixugazigigusazatug.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/vokufizam.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/dipimajilomoloron.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/37137118225.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/loxupisupulum.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/43942439245.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/0d3qut2e2irn15fujvdtpkdkv1/bisupu.pdfIn PDF document text
    • http://1976ahhs.com/clients/32223/File/69368114983.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/xujarugakupakogepiji.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/46821665864.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/xuzimumigerirujinas.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/papotenope.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/kizavufisevoketilim.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_off0000bba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B7 17156 bytes
SHA-256: 4a1ed1b2291f402056379363b0b0d962b556d8338dd43c810394eb2ebf2fe430
font_02_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 10820 bytes
SHA-256: 81342f9317d96d76b1673376f444b561e00469030d61a12701437e0d007707b5

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