Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5689954cbac41c9…

MALICIOUS

PDF

75.5 KB Created: 2021-09-20 16:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b481cd3e30091934d855b38271c752ce SHA-1: 5bd0f590bb6e3f4852ac61f0d07bbc42aeb01813 SHA-256: d5689954cbac41c98a61a6e0dcc7591908c4367a622a3ba6373592bb17fd8969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are designed as a link farm pointing to various websites, including compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • 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://nomylo.ru/uplcv?utm_term=among+us+hitman+mod+apk PDF link annotation
    • https://derya.afmiletisimajansi.info/resimler/files/82613528027.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/misijefajawuludozudolud.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/gosiwomesumilonejukogu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/af8a1df95ddee7053af9691ae50e1623/14849839209.pdfIn PDF document text
    • https://grnca.org/img/files/files/67726861754.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///mitekawin.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/16804535413.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/67661009496.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/zemonepowagadupinu.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/91823245702.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132635d7029c---7400299625.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/67517154032.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a18f0f969---wizigugosak.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/parodigazumebegalupoduv.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/vozodivekuxadudolasofegi.pdfIn PDF document text
    • http://lex.tj/img/file/89046638027.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/zorugajugumejo.pdfIn PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/deleni.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/21858185765.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/tokim.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/reberutolata.pdfIn PDF document text
    • http://xn--80aamwn.xn--p1ai/userfiles/file/kawujusuvanopeserid.pdfIn PDF document text
    • http://vatlieulamnha.com/media/ftp/file/11899944984.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/lonamopulesa.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/67483894342.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/nuxid.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_off0000c2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BE 17376 bytes
SHA-256: 9ff7a3019f6d20ebc362ad496a0ca842ce5236ee53a1c213b6b4314114b9788d
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10826 10736 bytes
SHA-256: 5c516c8622f24b0020c2b5fb29a18094e0f832deb633a2d6305d1da29a6b65d7

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