Malicious PDF — malware analysis report

Static analysis result for SHA-256 54f0d37239838be7…

MALICIOUS

PDF

63.6 KB Created: 2021-09-06 21:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f20cfde7cba7bfeff98c8fd452bf2f7d SHA-1: b85cc8915d5dcca24ada6ddd6fc8f285acfc67ef SHA-256: 54f0d37239838be7714fb5d6baa20ec02f8169b43ac5c62bb1b4b6078e36d927
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5692

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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/22b0943p6dakk7kc7ovd8lkpq2/felezo.pdf In PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d0191402d9c---wipoteduju.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/96107976066.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a749c859236---65447580585.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/9f4a1f19f2ee01129a250734c69604a5/42836093386.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c142c55a44e---62690906966.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c431554478---pujawi.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/xudagorojod.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e8a47f0a0cd---zuralerotowelitu.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/1r1gl7krke81pktn4377ja7ian/wepoki.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/wafiwujanozobuvorag.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/degurujiv.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3919eefb92---42641231179.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/81514122677.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160845f741ffa9---vivabukodesabirir.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c427446122---damogawonupoveja.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b3a7e63f5---tiparuwatebezuju.pdfIn PDF document text
    • http://arslanemlak.com/E/file/48555615669.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/6632423140.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/36992948934.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/pupizix.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/64966646633.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a2fbf62c---29549699150.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/xiposewoxinorezerumazes.pdfIn PDF document text
    • http://prestopc.it/upload/file/34948591165.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210731_80423ED888C4ED07.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=number+line+worksheets+1st+gradePDF 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_off0000d56e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56E 11140 bytes
SHA-256: f2d1475dbccb2cbe99c145a092d328cbeb1570ae8ca2f73b751b9c1adeac9121