Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8fdc4cd7f04aa0e…

MALICIOUS

PDF

80.4 KB Created: 2021-08-04 16:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f2e3de914eee71c3cc3146b84b530197 SHA-1: 20b5d639206207bfb9e25e6bed6ed10ceff710cf SHA-256: b8fdc4cd7f04aa0e592e9e7cd21f166ef1ae2596b63eae02034df9a2ef0a3c99
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to link farms hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8913

Heuristics 6

  • 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.
  • 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://faithleader.org/js/ckfinder/userfiles/files/vojijugefosovebajaz.pdf In PDF document text
    • http://canadanur.com/resimler/files/zevisedotuxob.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/segikaleruna.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/zeboxivesuxuxi.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210620/2106200537277398750v2iobhpigex.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/95c2ff6dc8652722a9082e6a6e6ad2eb/garoxetupa.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/40844529258.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce993000fe---jexesagujusiwedixin.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/dekerazufijumoligelo.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/63871058634.pdfIn PDF document text
    • http://esistore.de/userfiles/file/89507429753.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/91b66f00e74c230da8771df82e6cf0f2/84548112912.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a786a564c---22177362119.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6589e277ecf9303d9ff4f2687c3a5572/2187521974.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8ab88fb54a5ef1fd8443e6b6ed4c1b66/xabukixujizugegafofu.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/welepodokuwobodesu.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/ludokenivolasitopidatakux.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873e51e2b21---roxiwopupopituge.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/e6d4fd1ed10a732de4f5022f28265aca/86798410826.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/26647489339.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e13bafccf04f64fe40ebaafb802a89f6/nolozutiku.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c722bab2c---73159127382.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/77235675434.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a918bd4a9a3---basaralebuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pirates+of+the+caribbean+part+5+tamil+dubbed+movie+free+downloadPDF 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_off0000f85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 11412 bytes
SHA-256: 3486cbb31f9d57db7d2bbd5401b5ee63e89a0932e11b535a830ddbf77473f6f7
font_01_sfnt_off000112f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F8 17904 bytes
SHA-256: 62c235199d7da82fc0025230a5af57abb257f4abe423e7be294d03a9c91a891a