Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b58b98c75e1b8c…

MALICIOUS

PDF

66.5 KB Created: 2021-10-14 00:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 61143208bf215b48e86d8f140ff45066 SHA-1: 3ae071e6a93f2a642339407494cdc3e61a7d3d01 SHA-256: 73b58b98c75e1b8cd87acef12124c2e9fa176c378dc24c0b4ffca3a94b5ad35e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7151

Heuristics 6

  • 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
  • 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://jocafoto.com/fotos/file/vapewuvu.pdf In PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1632134858_a269500fe5.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/22513675184.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/80248955571.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/gizutelija.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/11794629968.pdfIn PDF document text
    • http://hbaoge.com/upload/files/kokaxuzi.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/xugelalosagomurunomesim.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/53673395835.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/korunuvodekoxu.pdfIn PDF document text
    • http://dylogistics.com/userData/board/file/vasaba.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/22131655911.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/22fc72f3d3160790860461100092140a/46533718970.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159537980450---vugejotezewabawanuner.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/13164025055.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/54112873158.pdfIn PDF document text
    • https://tckontrola.zagi.hr/files/54238999230.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/91225143233.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dba9d7ff56---pofajo.pdfIn PDF document text
    • http://unseretochter.com/images/file/88689233226.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/9622784687.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/sewamokidusu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161367fd7ecb56---42810578846.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/14134377540.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/73022851142.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=is+salad+dressing+a+element+compound+or+mixturePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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