Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc27386026832038…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 16:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d243924760905a9501bebca7d63f4d81 SHA-1: 91fc0fb09893eb36333497b460774d480ecc2c48 SHA-256: cc27386026832038b0e7f4ba5aa24c4a33c09bb08530eb6e58099847c58ddbf5
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a malicious intent, likely to manipulate search engine rankings or redirect users to malicious content. The document body is largely unreadable binary data, suggesting it's not intended for direct user interaction but rather as a container for these links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4580

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://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b91714bd---26833770379.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d153fe6a---ruzulidowaxas.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/busetoxosuveguminunowid.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609be4899cb47---ruludebojonibogenojefa.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/fobugavokilopun.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pekepurajotiriralodab.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/689e30c7d1c0fea74a211d0d01d1cdef/sizev.pdfIn PDF document text
    • http://rld-carbon.ru/file/26673398619.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be08184518---mujizugumubafuwetagew.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/nazojujobunameku.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/ratoxajekasiritedoma.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/43e30e39a164afccccc4a081a039ecbb/gufaniwilujubudiwu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/medadegolatevixuxafum.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/nuxuratewudovetekamijado.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/bulusagekagosiwujaka.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160923831ab78f---23652236651.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/koguzajelevajapugo.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/7509166508.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/14015418260c42c0b0619e.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/12032009689.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607943ca78a69---40821154053.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/97493467846.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///69323860901.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087fdc8dfd69---tujolixezegokinap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cours+hydrocarbures+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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 10764 bytes
SHA-256: f0f3941daa6ff56969157f61960397d40791a3b67be540d5bb55e7610d383f59
font_01_sfnt_off0000f89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1