Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ddc20b547a200b2…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 23:21:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8830554dcd870186c5405d341bc309e1 SHA-1: 54aba6831760145e8b657a76799f6436ca0ebcb5 SHA-256: 2ddc20b547a200b2c1e295354f074c19ce5b0fc26ffb96d98862eb59bf75623b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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
  • 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 http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160afc4293b6b3---zefidajarezududujolow.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e6bf33458---wudunugidepupigariguneji.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/88490085847.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f724bc0c1f5---rixafadarit.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759e4373168---sipumaxeser.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4ad2c51f984f7a8e11e12f0e0288c486/selikusadimiz.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/zidakerezufinisalo.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/buvudedomejefexede.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/42362055488.pdfIn PDF document text
    • https://mahae.hu/files/files/velazuwesixexiliki.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/xikatimuzesameseru.pdfIn PDF document text
    • http://domainecomps.com/documents/files/29239644484.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fc1c436d489fa8525d6c05942b484039/74537066226.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/25107109a8c5ec8e3490004ea21fd5f3/jetovudezimuporagilamebo.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f06d8bd921---sovonojogovumawunit.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/87132576036.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/jewezuwu.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/tanupevurat.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/faff78b72570bfa30b23fcb020462167/xoduposewowew.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160838480396f4---87606131310.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/sumozegapujodogozu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d991cdb230a---49669362468.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/44895794977.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609831cccd047---nunipimunanavubux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=churchill+car+insurance+policy+pdfPDF link annotation
    • 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_off0000b9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9EC 10864 bytes
SHA-256: 7cec1aab828ff46d30ec1d8ed05ec470bebaa00817eaa95b3d9904ba604a2dc0
font_01_sfnt_off0000d2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F2 16000 bytes
SHA-256: 7a0daf23a4e33b79d15b986e3f8b0e4dc7d84c89eedf963bb6d8275fdfe291b5
font_02_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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