Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a6ccdc01d089237…

MALICIOUS

PDF

78.2 KB Created: 2021-06-29 08:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 55c8fdd23eccffc9ace8d5c823d95e34 SHA-1: 2cbf230fa2190a4ca80f48006449c1073fc44d1f SHA-256: 4a6ccdc01d0892377e5c6b185db75d64c51662d5ebf8a7766dfe2f579d2aeafa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which appear to be compromised CMS installations hosting other PDF files. This structure suggests a link farm designed to distribute malicious content or lead users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16085c397e22fd---38416635101.pdf In PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/01pl9idc59if2fvdjl6rnn4m7g/62201644854.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ace6b822b5c---33482901391.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073365849d79---43224870071.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00e177ef2---fejijelupekututusirirafo.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/wawizex.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/fepupepuzuf.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/13358svnisi44fk29hecj2i02d/78085871452.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/gamurapejumi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/a5d60el4h86gp3dcekkgo85jsn/51784287196.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be088364ba2---75704751026.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a932dd3faf8---bepiwigolusu.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/roxegizizetekekudapixuwir.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/0d03qratcbtliav5tn2pfk9br2/besosef.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a126c59ce69---foloto.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/zakige.pdfIn PDF document text
    • https://panama4d.com/contents//files/fowobawolegox.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/46873516139.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/070702401525.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/e2069bf2976e3e598298e656a4d9b4de/wanegetubolizokuloz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcb2b1296---14611404317.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/8899ce58e301517139d9385741d4e69f/rawibapijefojom.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/2214tedtnsek5lcd300u7fmre9/bovanirulijejivekade.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/denebatawij.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/34027ab044b034a9441525e4d42c6794/zugojopurise.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c649531cf3---67376911820.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/dumetomogekaregugefewigej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=driving+directions+to+biloxi+mississippiPDF 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_off0000ce36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE36 17092 bytes
SHA-256: 6a8d5635c9526d753215ad1ed60630f0a30910d58c873d88ec9f17272db84ff3
font_01_sfnt_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 11004 bytes
SHA-256: 45a0854a5d00082b0309fa0e04b4c4c1f258844e84a4e51dcf4816c63952d2f1