Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef908694d762ae82…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 12:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9eafb0cf74401c9145e1504e662f001 SHA-1: 00a03fb4b652647276548b5979374a4cdce0dc2a SHA-256: ef908694d762ae82694994c4c4b3653938f5ba561c4c1037ce117b8311563b25
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous external URLs pointing to potentially compromised websites. The PDF structure suggests it's designed to redirect users, possibly for phishing or to download further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.1831

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://sluganarodu.org/userfiles/files/dasezodonimijujurufumoled.pdf In PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/81425389846.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/majudebolewagibunet.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8a770aa0a---68833700685.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/86908055542.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/betenalileboluved.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/60903b1e7b5cd99cf8c8fa5a90fb92fc/5237098172.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/wemuxov.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ldvr7pabaec9b477rcsokv1966/medulusewaxowetos.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10150305810.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/suredebaribe.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/bc11f1d9a7d922391927915be2687c1e/57491164295.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e27764b38---69251497214.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/revij.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6438ec6d2d---bekeseluditu.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/pijikopitasobutexusova.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/bb8365dfd6365b5e9a002abc6fd7fa37/38074626297.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/xekibewexubosetak.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e99d4472b---bisomumakitutoximader.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/48035707794.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071b76c4b177---79307719513.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9d9dc31599650eec19c7a4fb7e2042b1/ronizuwanimakuxajosafip.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/91135067477.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/66673772368.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4373cd1745---tokumoxadenurujuzadagexuf.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/08/files/210810020842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=plastics+used+in+medical+devicesPDF 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_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 10476 bytes
SHA-256: ec217e3c54598a8f853940b19e7087ec21414d4de5b72fb630ef27e1d43ab362
font_01_sfnt_off0001179c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179C 17736 bytes
SHA-256: d91bcf0cead78fdf2674d288ef3f63d228f54d404191ca90486e62f2020cfde8