Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37a976e842ef320…

MALICIOUS

PDF

63.5 KB Created: 2021-09-01 11:12:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5925d7e8ed7d1d9a5118bff8d4b7da99 SHA-1: 9a2734a240b3ac7a02140c1f8f8f7815a73a6ea1 SHA-256: c37a976e842ef3207e3d55ef6670c8a3634927772e136de34ccf2a405c5fd583
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, with numerous distinct hosts. The primary attack pattern involves luring users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9087

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 https://aiwatopup.com/ckfinder/userfiles/files/161290194.pdf In PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/10638999707.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/32639139635.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/korobofoxobin.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f35e93de6a5c724c3216e8aa2ad2dcf4/40764760447.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc84542a9d---josapopubifanulubevujejap.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/janek.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/76573c0bb3672e0923118cb4a5af0e2d/jixezemutaje.pdfIn PDF document text
    • http://sy-smile.com/upload/files/petixomivagumobonobo.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/jaxase.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/o6c8lu2c4q4l0ksjojggfqbkkn/10305463022.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/06017e7c8a70b11a268f4296d2e14bdb/66424797700.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076814fabb41---datopirabexesave.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/54798917016.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215131558357716.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/sovov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c0fd638e4---ragemenadorik.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/92199091712.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/pivoribilul.pdfIn PDF document text
    • https://telenovella-bg.com/files/62222738055.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e48d94b013a---piwilejuxilusuvasuvope.pdfIn PDF document text
    • https://airshow-bg.com/file/gozezex.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/zavodanixa.pdfIn PDF document text
    • http://irths.com/upload_files/files/jefetaxogajetigidelatis.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/3762276593.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=what+is+the+role+of+primary+producers+in+the+carbon+cyclePDF 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_off0000d2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1