Malicious PDF — malware analysis report

Static analysis result for SHA-256 8993457e78e0e49c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 03:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5cd62b6778df7422837b6ab3a8c42daa SHA-1: 30af3b72ae3b75448640d4f0119b01fac6938817 SHA-256: 8993457e78e0e49cec26760ecc0ce7bcb1f4993e4b95a080fe839d4f96dff4cf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5019

Heuristics 5

  • 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.
  • 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 http://hakasasi.id/userfiles/file/tubugilipolut.pdf In PDF document text
    • http://tgtech-auto.com/userfiles/file/diwewarawosamunakike.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/92239716596.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/1ac8aee26bcad1c704c077590d1bbd93/26878376862.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fbd254158---vojakifuzofosovom.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0075b2dff---61948257482.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/kegujil.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/nekulisesugafuzuju.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae61c39a93---goxudatozaf.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/32027137975.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3ddf5ad8e9c2b20294641389db3bfd15/wazera.pdfIn PDF document text
    • http://www.moyekolodin.com/files/85046328701.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/17065666918.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6fbc036b33b87728e837b8dcf04270d4/26103792306.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/24638696619.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/68872183480.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/7302497888.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16072d648bcff8---71364422467.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/fazakipagusinam.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/wawinadojukasu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qoopi6m31opvo914ve4dhtihiq/37694192988.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072656b05129---tefutotekaguze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=walden+by+henry+thoreau+pdfPDF link annotation
    • 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_off000105f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0B 18312 bytes
SHA-256: c0a52bb181b170252e814b771153338a7d6525bcdfaa4205c24449dfdef476ec

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