Malicious PDF — malware analysis report

Static analysis result for SHA-256 93a3de499e532568…

MALICIOUS

PDF

131.9 KB Created: 2021-07-20 17:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa8890cf88b7d1688af3b1c454e50567 SHA-1: 3e5cec6e8b1b023464d55796cd3808b0354046bf SHA-256: 93a3de499e5325688d3e879d951f5dc46ccd66813dc6d35520a47bf5f84ce4d5
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is designed to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5176

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0bc99a72b8b68632f910e31867106de2/2196108665.pdf In PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/86822aa8d27887646c8f655f489d891c/49663657943.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/67e788495a56426194fad5a1ae2b6c99/50715590642.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47680384235.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/vuxovuxukalu.pdfIn PDF document text
    • http://imaginove.eu/data/Files/86513754579.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/8704096719.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec1b67e404---jagibegoxewinelazu.pdfIn PDF document text
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/1420146051.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f61148f8edba35e5964b7dc9ffbfc52d/wabufamevijojavo.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/84507355948.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cf5edd5b4c6277358927d3b684f2b122/regez.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/9100ecda781a4870b321397a548c6525/64225177748.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/56907581300.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/0fe6562525a85b76ce7825aa8f40479e/petedukedigigukan.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c7974d5c8b8---zaxaziwap.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/44177467911.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/86064570657.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210522135153.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3485b3cab698208f455c4ed6905fd365/wamolorojozulajisuw.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/boritexazore.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098896e6f317---witexozigabudu.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/kosolabokivokebon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=belly+of+the+whale+biblePDF 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_off0001e0ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0EA 10332 bytes
SHA-256: 39d25ea660fb545c253d7f1f4cb0df51257e5a699cae0f1fed0c8004a9cd26a1
font_01_sfnt_off0001f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1