Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c91894307bcd0b…

MALICIOUS

PDF

85.5 KB Created: 2021-07-05 06:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b69541ba02f3d6d3c50fb82a9c7902f1 SHA-1: 3e5b6b14d396b78b827daa72d20366eab47f1cf6 SHA-256: 77c91894307bcd0bc94004ec4587a0cdeeb135c3ae4c706d60afb0ea70fb8ff0
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The document's structure suggests it's designed to lure users into clicking links that lead to potentially malicious content or further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f86dfcb252673bd3662d67b0a2eb893/xejupotaloxasaw.pdf In PDF document text
    • http://artecgroupservices.com/imagenes/file/53796928387.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/kuforejowedawesobavidusu.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/69606403376.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5b413cd8173be443df3f41b26324a19a/witawawokigu.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160808035d943e---27003433698.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9a284a662822d25759f6c2bb7f0065ba/tagivisufiwavumapedajivu.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/ad854a39c140362b2a3f58944f80cd7c/mugobemosolejetokot.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160999f4ec71da---48743547490.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ade5f2de16---ledixegabixotakoguga.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/plm0fh7cdi5fugdc51hvq6ov2q/79514941919.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cb2936ae7---majirofuwonefa.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bccdf907088---67004497775.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/pevajoves.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1f9ffdabdec88b5e4563fec4c6012a53/dudixujer.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/ff435c268848ee28552f12f3b935a6e7/tizenubavolirikijuzeg.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089b04f991cd---deboxomafamipubi.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/opf00k154khp510l18ef2uafse/9233991628.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/solufagirizasewinezutin.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5f3989945---tevidabujikepenesilugev.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8a22d70984f72820ba394034ec3c3517/81399035087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=storage+space+cleanerPDF 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_off0000eb83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 17432 bytes
SHA-256: 02718cdc34b8f8b9c7059ddf56d74fc29d74c6d6b7e56c388788f20102756147
font_02_sfnt_off000130f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 10532 bytes
SHA-256: a86b925738a251d1b0c2f99718a7a28e0a9d518db1588b56e2206bf87776bcae

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