Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24e1591b7f25b89…

MALICIOUS

PDF

75.0 KB Created: 2021-08-13 05:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32fefc2b8d449cbc46d78845c51d0c56 SHA-1: 9c740ecae43c0fc3416079bf597ed21dafd08515 SHA-256: c24e1591b7f25b89f715d99bbd4aff29e6b9c1636be3f65f7e6f00322bb61c8f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of multiple URLs, including those hosted on compromised CMS uploads and disposable hosting, indicates a link farm designed to obscure the final destination. These elements strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=duplicity+harry+styles PDF link annotation
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/d2ur7otolugu62hqfmjcm7s4al/17787982051.pdfIn PDF document text
    • http://berbun.com/user_img/file/narugisikemijukiviregite.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/7227255138.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec1d0e32a---48823999756.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b29e05ac---984527739.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7b9952cb5---bepizeguviza.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/jelalanikunexov.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/14525245048.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jupewosevajesolusalixutoz.pdfIn PDF document text
    • http://web5gstore.com/Files/files/54208424744.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/87647995220.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610d5d951fc08---wosetip.pdfIn PDF document text
    • http://manixcnc.com/ckupload/files/wogejekutaxin.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80762c83ad---kutigubatikowejozavimibaj.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b798a8094d7---14603720689.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/fuxerevoxutaku.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/neginawakolerogatugiwozev.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2jufmd4bmkf5o8hcasnvul9h1h/xolinidujobiloga.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/igpjepoqajb5dahkro5rnri5i0/luxelevib.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_off0000c353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC353 16464 bytes
SHA-256: 0fbabd85152396d2aae15ee87ca20dcc2380108ca7fe770f45f8811b42ffb0aa
font_01_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10611 10460 bytes
SHA-256: 9c91ebd5c777e999f4f271c3e026a7343c842ed87f90d0219edc7c31d633bba6

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