Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76a79bbf8b378db…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 04:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f84fe58070d13fe20750ff148f80e2b3 SHA-1: 6c73583f0fce96df5ff682e7c0eb954e1747b2d6 SHA-256: f76a79bbf8b378db35a4d5cdcea987081691ac24c05374ef262125ca6c6e3943
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ML classifier also flagged the PDF as malicious. The presence of numerous links to PDFs hosted on various domains indicates a coordinated effort to host and distribute malicious files, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9513

Heuristics 4

  • 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.
  • 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://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/rt9b9tjedu41qqdhk56h5isqbb/puzut.pdf In PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/30p801t81hsod6alpqbf5nh1se/nepowex.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/gafatepijomasobukexozi.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/5d02fcd8042ec5e9702caf336c12b111/tutox.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/topujabopojizuraxetot.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1707f1c02---72708106783.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/obhk6mgpute6g0cj2pateniccg/5825012518.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f485407c8---pojipig.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a7b5843b9507e6536f26dda806aec3c1/gatawepatugenureboj.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/xesotijosux.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4dcb0169c---mikosiwa.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/11c48430efa5dae6bb8eeed404638299/80877115935.pdfIn PDF document text
    • http://capableapp.com/uploads/files/vutiba.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/91136588347.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/4922602193.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3e6efce3889f32aac2ff56040642e157/34668184554.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946f74c37ff---73798643362.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/fe70b32e4978afd7688fee6e15238ce5/51565898812.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/kenifubebebekoxipakelanew.pdfIn PDF document text
    • https://satesayap.com/contents/files/repemukokazixetuvit.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611cdaa8ecf8d---34161665208.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/tajaropupugala.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/3f5fb8e5ca3b8a435409b7f5dbf9d6e3/81420238806.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/nidunimenusulolonejede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=data+preprocessing+steps+pdfPDF 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_off00011837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11837 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1