Malicious PDF — malware analysis report

Static analysis result for SHA-256 591d9113237b7b4e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 22:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 971b3e4439b79ebd585b14221721c0dd SHA-1: 14548fcbb34de5d34099e2f107348abab6402503 SHA-256: 591d9113237b7b4ef2363c0f2e3aa17462d454750b1fa106c931a0ec0eba39b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=twilight+saga+new+moon+full+movie+watch+online PDF link annotation
    • https://ctcitsupport.com/media/files/kujuzilabuzezi.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/luvusolizagenesevogo.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e800a7926b---gisivu.pdfIn PDF document text
    • https://biomisszio.hu/tmp/tigopaziju.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/nobigitaxiluvejubaxosi.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/71334680139.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/xuxabusejuxopem.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/dumetijitunivefut.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/a8b8lhh8vhkvlst32n0gsireiu/genezuwejipoxikovumobetip.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/32636982269.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614177f63c1fc---xebutarafiwavuta.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/mevadosolutejuxed.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/jagafuxadoza.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/kojobejavasoru.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/lexezixok.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/81294225194.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/3928178157.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/27650029089.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142091c115db---lavifatitimebaz.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/zegalawobalevok.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/26883653059.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/25108507597.pdfIn PDF document text
    • https://atlantidegattico.it/file/54031216823.pdfIn PDF document text
    • http://xfswchem.com/upload/files/53914686106.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353513c03fc---92264737682.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_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F2 18268 bytes
SHA-256: be11ecc5038915d22cca19d5b1aa225fd7a54b5ab61319910996bc0024badf5d
font_02_sfnt_off00012563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12563 10896 bytes
SHA-256: 644c644c3f7a140effd5874ffbf5b4ce8648a23f3c55cd3259e1799b00033516

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