Malicious PDF — malware analysis report

Static analysis result for SHA-256 c830c8e94f353a7d…

MALICIOUS

PDF

68.2 KB Created: 2021-09-28 19:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62e3efd5205f23e3378b40669bbfc5b7 SHA-1: b4e60aecb874a5b53414622e21f4e16ee24ba2f0 SHA-256: c830c8e94f353a7d41c054fb4e9c8f3a9737c8be2b87c5e205df62f189b0d654
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://medvor.ru/uplcv?utm_term=download+scary+teacher PDF link annotation
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0ae2d3255---39160256102.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/mewasomagiduxadag.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/82621339952.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/24029906771.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/fd2dbf5e715d3da15297268cafa5fe0f/koposonizoseboje.pdfIn PDF document text
    • http://balone.net/_upload/file///kages.pdfIn PDF document text
    • http://arucax.am/user_images/file/64750578261.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/wexavuwixemefan.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/87040499973.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/loviramukubewalujovom.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/fawoxufebepiwuzuxizel.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/38008510066.pdfIn PDF document text
    • https://menu2uplus.com/images/file/20512261010.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/75695393183.pdfIn PDF document text
    • http://www.og2c.com/images/file/diremuropoganu.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c7c647c2b44ba5c50bb2870110f26952/67618487983.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/78127373582.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/78959457145.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/vazesebidorasekudov.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c3edf5bf---99481367950.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631422269.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/domawewafobuwepesaropok.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_off0000ae69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE69 14732 bytes
SHA-256: f0c3ceca3496f65e1f17c4f887ee0b3a7cfcd687c90c85a64bf5dcf6c8dbd8fc
font_01_sfnt_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 10576 bytes
SHA-256: b6c9f130ec4823d0469be8b0e7a8b99d39cefdc11d143f8a989fdeb65f28ab41
font_02_sfnt_off0000ebe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1