Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cf254399c6920d5…

MALICIOUS

PDF

81.8 KB Created: 2021-07-27 22:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0eb17abc483805879e71e76cd49586e5 SHA-1: 8f1ac0b4007a9e66b18f27378fbc263d4229f425 SHA-256: 3cf254399c6920d519c5bccfe0f97dd59c1cf295253dc3cbe9ef690df0a51da4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting the phishing lure. No scripts were extracted, but the presence of numerous URLs on compromised domains suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/0lnaa17bsp7mdt08sui5n9na82/fuginekonarosagux.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/mududusarilola.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/32367706750.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062910112567.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/zusowumegaxubusilowini.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/99456955864.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a1d83235b50---kofesuwoluguximakereloto.pdfIn PDF document text
    • http://mutitar.com/user_img/files/sikoza.pdfIn PDF document text
    • http://cga82.com/admin/File/bawuzadotapen.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a072b2dea---55045924501.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/eadb8e8fbdbae56768e3ab047ba67800/jegoku.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/sugawoduragova.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/xavavusudadasibamevajal.pdfIn PDF document text
    • https://ka-base.no/images_content/file/95819715436.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/1fcc5a6b218749aeaec5a80b00a2777b/55350786325.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/tenopoko.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210615003542.pdfIn PDF document text
    • https://flyags.com/editorResources/file///kojobukelivigezab.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/luxibaxizimogu.pdfIn PDF document text
    • http://df-2.de/images/daten/file/85610990624.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f660b0b228---99116772027.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e5edbe2c2b5ae8f0bb1ea5c8c9107676/vifegidabuwa.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f13474ea39---2502829283.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/24575683b3981cc9f7e92138ae3ea401/28426755794.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/foturatimadiwiziz.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/wuxutuwifefufoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=download+template+login+hotspot+mikrotik+responsive+gratisPDF 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_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 17116 bytes
SHA-256: d21025ce1d0c4cbd8794024a5c916aad0d325d00df05a86987b923de0593fef8
font_02_sfnt_off00011ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE7 11084 bytes
SHA-256: 4254c905c6ffa03afbf45af24f63b0f22e282686e6b84f47ba728b7c40e16cb3