Malicious PDF — malware analysis report

Static analysis result for SHA-256 66aff7484f659418…

MALICIOUS

PDF

78.3 KB Created: 2021-09-15 17:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: acefc8d2501f5560a8135ca21766bda8 SHA-1: c6f91892116a30996273e0ed48e659746e69d094 SHA-256: 66aff7484f659418cf9d18b2b75950b5ffe90838ca086b148dd23a24922f9efc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and the link farm structure suggest the PDF is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://oniceh.ru/uplcv?utm_term=geometry+dash+speed+hack+android PDF link annotation
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ce6721238---volugozuwotuxupiruwakixi.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613088e748225---71306536463.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021090303120146.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///80978636280.pdfIn PDF document text
    • https://breedlife.com/upload/files/49445582305.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/vudowifavu.pdfIn PDF document text
    • http://futboltotal.net/images/files/vepunubuzujixosimi.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/76254179054.pdfIn PDF document text
    • http://mobil-tech.com/files/baxuxozab.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/jarekizukis.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/regapavefujejupelu.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/71659089931.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1bd3b309---29379758426.pdfIn PDF document text
    • http://generoussecurity.com/uploads/77047209125.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16131be01d34d5---betometuvinegetesudisune.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/47572813633.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/83120479115.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f57f27a28---36289411619.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/sikoda.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/61998531238.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/9288883802.pdfIn PDF document text
    • http://precisao.net/files/files/79417181304.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/tepedudiziwotusibojo.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/32681147362.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/62237404318.pdfIn PDF document text
    • https://onthespothousing.com/userfiles/file/87056461656.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 18348 bytes
SHA-256: 3fc067d82e4dfc464af40919d55724dd32e360c6035b96d8915565efa90ef7ec
font_02_sfnt_off00011178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11178 10980 bytes
SHA-256: abfb5b99c663ff5a88ca1f8b21edaa3199253b138c551f39c885aaf61c7ee348

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