Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f6d8f24ad11f9d…

MALICIOUS

PDF

65.1 KB Created: 2021-05-31 08:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0912bfc4b925f1fcafa9a49d3a174d0 SHA-1: 60aa7cf8b5ae9157d3a03d57681f8bcb8aaf83bb SHA-256: a3f6d8f24ad11f9db817b16b5846a8cbb3ead368a29b1f8e7e03728e3f7fd269
94 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. These links are likely intended to redirect users to malicious content, such as phishing pages or malware download sites. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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://nomylo.ru/uplcv?utm_term=la+classe+de+stef+histoire+cm2
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef4019c96---wenaxodusomakerir.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fed01e9b475e91dab045d094e5cb9df4/pejusolelapu.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ddb2c207f---60490049860.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3a8bk12svfbklo7le127s22fmh/zemepej.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/jjgrf9svie6pee8cnl4r8emjdl/dekomitozuz.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb0719ab2c---18832937140.pdf
    • http://magendans.com/imagefiles/file/38175764308.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/mdtfnh9baa8qrgjreun8ltpog2/mosanegapalujurivemema.pdf
    • https://communeouchamps.fr/userfiles/file/tilegejokegozona.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0310b113c---82972755611.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6cbd95dc0---7583904992.pdf
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/5fcc04bef8e4efaa11b838ee665d4940/nusefopakamoniromijixej.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/79086120105.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607613e6e04e2---39528004190.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a496e8438---9958703527.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da93.bin
4ccf453c7a1f248ec84f1784cbe49f225edd8c8c64f63016b10849ed468815f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 5016 bytes

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