Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8ebd803d0e6540…

MALICIOUS

PDF

90.8 KB Created: 2021-08-05 14:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b8e1885b5537a1ef07bc0c2047de7a4 SHA-1: 54813a4edd415c7088a7bcdd19bca2e2ac4c5e64 SHA-256: 2a8ebd803d0e654067d8c8a059d5460eb6b0a7f38e1e8f1e8f91b7b6b95df7d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://pelesiuvalymas.lt/i/File/52720032692.pdf In PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/wezokofasovazugudimajedi.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/18209745158.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fb9ac3d40---zekafotisawemovobuwawiw.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/pr581l894pet9hrpdvl5a0eh01/fipiluwudevobalitet.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160827ed8c3b77---tivafarez.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7tr5b2nourjeuoud8tc6nou5sq/kusinisemelesokefenugu.pdfIn PDF document text
    • http://northstarbaptisttyler.com/clients/a/a4/a4b4c2e389351fb2dee96c3f727c6a57/File/46371522594.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/1fcb40a6f0e1dd28f602e1fe45de7157/wokul.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8328b90fb944e289662bebf910680f2e/80767496786.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090711c60b44---bepukemikafovozelesep.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/52236316977.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/fisipe.pdfIn PDF document text
    • http://burrburroughsfamily.com/clients/55468/File/tomawimu.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84cb18f1e0---26528762268.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/aba1ed295915f659b594039c92d7c50f/pepixaleguje.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb3249b79e---12423935622.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/14710794378.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/korije.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/69334515469.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/8263649824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=la+biblia+versi%C3%B3n+israelita+nazarena+nueva+edici%C3%B3n+2018+espa%C3%B1olPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 11676 bytes
SHA-256: b827360a6c42adec7e74069999838705c1aa0143909b8ede00cd6edb22328c44
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 16460 bytes
SHA-256: f0fe38d53df2ce3c228211e06f06f1f94e2995311f45ce30f4c3b58f390b1dc0
font_02_sfnt_off000111ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 18788 bytes
SHA-256: 5421838cfb22252128cb6418343f6fa880c7630f6ad8d41d39820adfb9ab5f62

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