Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b899c022a2e3a7…

MALICIOUS

PDF

67.6 KB Created: 2021-08-18 15:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c925a4d2381c7c68b79a877e1a49f9f SHA-1: 12d22734dba86e886d12ef21ffb643fd28f2bbdf SHA-256: c1b899c022a2e3a79bf92511ad5ea183d4d2abb381792761a9399b816e9ecbf5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The PDF also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the ultimate destination and evade detection. ClamAV and ML classifiers confirm the malicious nature of the file, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9431

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://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720adce1bf6---78318383305.pdf In PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ienqabo86edkhcp2t43knv9ogj/1594612939.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a807e9d000d---folizoxedozivesuvi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710179ee8f7---67735750340.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7317300bf0f645f62dd7370b10ed3e49/87514456191.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fb5dqbgj3dprdi4vf1bu24siru/raferalumem.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c1cf74f8b---vekipofijado.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/88171984365.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606f606de2554---nuxegafopigiwomuraxutigaj.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/pomawalexinuxusumumas.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/2544036531.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3da7dbf2a---niselozidezuvu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cda51f8d9985aa24662398215def1cb/galawotosajewutogimegali.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/2621hsrojb392bbki3j0u6j1l7/24653227625.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/48274347139.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a392a3a059b---kogizov.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e307a70e20---godoraxefuvefaratom.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/8223969549.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/suwuzaru.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/rufemejeluloli.pdfIn PDF document text
    • http://hasyo.net/files/file/situvogotuf.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/3a3caef0ca888638d47a810bcbff084c/favoxuxikadusodisiwusef.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/wopavakeperib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=descargar+adobe+audition+3.0+gratis+en+espa%C3%B1ol+completo+para+windows+7PDF 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_off0000e3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FF 18432 bytes
SHA-256: 87ddc879fc176cb49263582353634affbe42782217b657c9aec145012003def9