Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c1ce3c72bdc6504…

MALICIOUS

PDF

83.3 KB Created: 2021-07-31 10:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 315fa2dd7267cb0946e380e7006fa334 SHA-1: 2e6c93f8993a28aef0361619302d7b5b7c81a5cc SHA-256: 6c1ce3c72bdc6504af4623e06d77d4dd6d32639a163eb90ec4fbf91fdf4f174b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm pointing to numerous external URLs, many of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted from this sample, but the presence of numerous external links indicates a likely intent to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/verawekuguzagarorib.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/4l7o7fcd2b0dvd50jtbhsb1r45/tajusobenabififo.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/57858912578.pdfIn PDF document text
    • https://allianztc.ro/files/file/11670385847.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f766c12ccfa0bb950023d2e5bf5ebe83/95810439842.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/bimenuk.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/197f64ea139ba8981c3024eb3acd4ac0/mafumosa.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/dizajetafetitubilozugewe.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e46bf5bb85e16f0c968f6ad5879afca3/kisuriwaxunu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8a25dffd1---1940857479.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b7b268a72---36428607514.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4528540cb0---fowojawagidurede.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/44261208220.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc3e95fb2---27097698380.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/dokuxilisifur.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/57362443945.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/foguvemiwoleluwubi.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905917db3ef---92231117982.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/e10779c62e503a51435db607ea6d5637/6295900706.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/vakoxudumo.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/nonivafokexij.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105111143.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/92055726518.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jabivoxovemutife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=dibujos+de+dinosaurios+para+colorear+e+imprimirPDF 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_off0000e11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF931 17928 bytes
SHA-256: 5bb6918840acae3cef7ec0c8a52e61ea0d0a871957bd9a110481e4dbf47d5a71
font_02_sfnt_off00012686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12686 10948 bytes
SHA-256: 6f52517afb83447e42bc3e711226a6d2554628eeaace2e64423d1902c90dbb32

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