Malicious PDF — malware analysis report

Static analysis result for SHA-256 76058d29dca14512…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 23:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a79a01dc84dcfb07a951bb6818cce2a SHA-1: 91915849dafbc53c32712c8a98a903398f4f53b8 SHA-256: 76058d29dca14512256476e3aafa1f8be42083e2e195d10885a602e66edfb617
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, many of which host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. The structure suggests a link farm designed to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://confetti-seasons.ru/upload/files/fakazeto.pdf In PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/e70fe3ab39be5916d9ac9be9a9bc39c9/ranad.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f6d4ea14fd4ce40c47a5e135ef36c28b/32412745565.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/buwowebotabimuxuwevoj.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143269c46a80---tunudirutoganubunulutak.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/gugoxipasexovofakofef.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ead790cf84be1ceaad59ac1aa7a61f49/nuzajopibadezodaxewejito.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/bexotakug.pdfIn PDF document text
    • http://metapolar.hu/tmp/lowidodevewidev.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/bemijerod.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/30922199765.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/92950765481.pdfIn PDF document text
    • http://chipgene.com/image/files/20210902_172715.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/lejavudexanuzobewage.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/77607695942.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210911_E8A4ED4B38408460.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091616525497.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/xawixik.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/2917719694.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/84635727838.pdfIn PDF document text
    • http://modern-pro.ru/files/file/40477543801.pdfIn PDF document text
    • http://evola.it/userfiles/files/2267532652.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/21132153719.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/mojodukexuvur.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/pudagaxix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=twilight+eclipse+full+movie+freePDF link annotation
    • 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_off0000d939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD939 10876 bytes
SHA-256: 8585ab70dc1ac40db74538f3420ccc64651084fb9b15a24840c4c986a22c9b33
font_01_sfnt_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 17156 bytes
SHA-256: 4bf481c1edd33015458ea8c7be7c3937637e2516a8cc2a8c5b22eb0f3beed4f0
font_02_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1