Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd106fa24497aab…

MALICIOUS

PDF

84.0 KB Created: 2021-09-02 08:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0324d74a87d5d63a7bb27974cf40a4c3 SHA-1: 64219c9308731ca3e4c258b8ec7db674df2fb189 SHA-256: 6bd106fa24497aab1ef1124e33eb7255abd8cb05a16ebe53702e497e868032bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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.
  • 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://philabc.ru/uplcv?utm_term=sat+2020+october+answers PDF link annotation
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/77d51c529b05d8de39178757c4928725/mubozigomukilosinewabuwo.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/73056504381.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/8d502c8326257999b6d0344401c6e9ff/42871501802.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8e87f2bb4---bafigubasujogi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/b6b17905a14c7f27dc097dc7eb7a490a/71031167861.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/4f4b469a053a207cd877d1e09a7708f8/14297820681.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/kaparabamumor.pdfIn PDF document text
    • http://flirdining.com/uploads/files/86635892389.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5d7390fc58217c8aba77c56721b7c97d/jomix.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/wafogutodenu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f29a4f5c2---80277309667.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/ae18b7ff3d2b637615384a0de36a099c/26454054660.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/43154626417.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/debasejigup.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/xetovemaxarabikep.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/83448785205.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d66a5c417f---kakixo.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ng97jvkigjqsmvt1ijf3278a93/bozusulepafil.pdfIn PDF document text
    • http://aifamilyreunion.com/clients/59202/File/webagev.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/87086917285.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/35663887132.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107160409562804.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/inuonvpvhj7enlp0dtskfvfq07/5841830975.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/71251176247.pdfIn PDF document text
    • http://labotinnghia.com/img/files/neremuli.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/munigasafobox.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/gegadajixija.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_off0000d68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68E 22080 bytes
SHA-256: 8fbe61912df09dd204bd991a171a89e86b3121ee2e6eb2262dff4294f7de4e0d
font_01_sfnt_off00011025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11025 10628 bytes
SHA-256: 7f57839e7bd6ee6c866b05fa2ff5c6b1a132bda0a63f6fc5b56d6ebeff773fbe
font_02_sfnt_off000128b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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