Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2b7b7f6f35c88f…

MALICIOUS

PDF

73.1 KB Created: 2021-09-12 08:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1dbbf6cd56374105e49b4972a2a6cad SHA-1: 718372a76ab9d2b25766a7c927816800820af4bd SHA-256: 9a2b7b7f6f35c88f04a5638cce7c8c310e8a87eeb9ce1d7d76fd3a08916d8437
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://flour.co.uk/ckfinder/userfiles/files/sogarin.pdf In PDF document text
    • http://chuanghuilaw.com/filespath/files/20210905045521.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/dewixi.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/87241110080.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/78353852695.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/riwokegebijekiputen.pdfIn PDF document text
    • http://topflexsports.com/uploads/fedugotivizafuk.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/105bef35cc8e1fa88688f5ca0a22a5e6/zulixuned.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ac78fdf0e946875b136fb4a1eaff83a7/60430339656.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3590591c7---42609731705.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/lovuwolojonitepewel.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/tikibojuku.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3170d427---mojedelamogewowigegove.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/59690711509.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/zomolifoxedobob.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/fizufokedokatopar.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/gafilalubajuforanet.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/sefufaxomosojupomuz.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/xuxikog.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/sutavuv.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/lfm55libtvoodtoaghhdgim641/30378652050.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/xugidinejozusifagaxemi.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/mobagajewibadoditolazi.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/86168567405.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/zanovapuvapawejopifufesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=larivaar+guru+granth+sahib+pdfPDF 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_off0000bb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39E 10740 bytes
SHA-256: c0afa0f815345973adc3b19ecf911f694966ec8047165923ce8755fe30c67900
font_02_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 16952 bytes
SHA-256: de9f68abfe9c4b42ea83b138549dc5bc5b093ad98cd6b007a80780ffe2a5f53c

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