Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2f8c1397fa5816…

MALICIOUS

PDF

67.5 KB Created: 2021-09-13 03:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bacb8d52e3e332ae694814b79d0c78f1 SHA-1: 298b248adef0f5d2b724c4ff93c1fc5f818de615 SHA-256: 2f2f8c1397fa5816403420c73825b8dcf5e9c45b607fee4387296b7229ad5c11
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, many of which appear to be disposable or compromised hosting, suggesting an attempt to obscure the final destination. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or trojan distribution intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2894

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/fikenexima.pdf In PDF document text
    • http://dream-mebel.com/pic/file/9599610179.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/lukenuribilerikubozo.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/vutoramosukejanakat.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/6015966888.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/39995584772.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd17bfa10---vodojutib.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/70349848701.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/nilemeretevunixor.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/rexatagu.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5334d320---49938859918.pdfIn PDF document text
    • http://platcometals.com/images/file/33897120841.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/kejexapitesetixinedirato.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612faa2f126b5---69007171650.pdfIn PDF document text
    • http://air-con.ru/upload/files/48573939262.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/nawutorofujugusew.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/kejaxuzurexu.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109130817018883.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/zaxolelegaw.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/kifivujatafekukisuzuvoju.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202197109343224.pdfIn PDF document text
    • https://camphacement.vn/upload/files/kuxaluvonoge.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/99684435547.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/meluputujipu.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/dujipabupepigemo.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/55991477773.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/32828075356.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/lovunelepotanexilup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+find+the+quadratic+equation+of+a+parabolaPDF 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_off0000c72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72E 11012 bytes
SHA-256: cbb755133f857fc2e8da6cd2edb5aa95c9e73f9958388f3932de4e8230e5c9b7
font_01_sfnt_off0000e02c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02C 16688 bytes
SHA-256: f8a5161479e083cd43f8486bb36acf34edfc290bde3fa782312e381593d0348d