Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c328907afb19399…

MALICIOUS

PDF

66.9 KB Created: 2021-09-06 15:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 28c21ce4dd23afd7608d338278e3320b SHA-1: 9aef28bf03a893387d3f98c8d08119f292d65bcb SHA-256: 0c328907afb1939937155bcece8a8462d93b62b81d4eaa56bf2547664593ae16
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of URLs, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that the document is designed to link to malicious content hosted on compromised infrastructure. The embedded JavaScript likely serves to redirect the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6457

Heuristics 5

  • 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://ytdrive.com/CKEdit/upload/files/sapagabopepemusuxiw.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a906f7103433e08040d22c3081bef573/daxira.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/4fd3ac4dc19a45a02183b6c3261d45e4/xijojesux.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/93250344934.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/42580526216.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079d47d2dda5---soxupukix.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084426ada7a5---sazote.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/vewod.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/dumizulibum.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609762dc5ae66---80313494371.pdfIn PDF document text
    • http://goref.ru/files/file/geradobugujasu.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f6757a85---48924110810.pdfIn PDF document text
    • https://vendax.ro/files/file/notumonuwojusaraso.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/gakujobezakuk.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/723165876.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d08cbad89b---muwemawiwanenu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ca940f47b---fukadegeveferi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/85d7cd73d07a39ec979568dd96ef6039/78637618621.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/93322810011.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b1b3f1d84f4.pdfIn PDF document text
    • http://0930actress.com/files/files/92118381854.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/vgsrum72e9cffhhn0eju2okkka/50576606336.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/97491030284.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/69854008668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=quadratic+equation+graph+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f2318459235838d37d24a49844c81520/14438750035.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE486 16756 bytes
SHA-256: aab6f454678ac5d0b15e9a73e03494a69d02cf8e082836e5e30e7343dfab6a95