Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfb4734e1949321…

MALICIOUS

PDF

512.5 KB Created: 2021-08-09 22:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 68e0dfe433fb68b440849ec93bb97c70 SHA-1: c141923772f17d17e22dd57be9c3b54ba72fb67f SHA-256: 6cfb4734e19493214e99c6d95ebb9714b0f4a6084269bf5b80c86e97f156c1f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7837

Heuristics 5

  • 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.
  • 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.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/xutupesepobaxikug.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fc5e6d6f7a70b4bb95b0a2e65b2b83dc/vajaxoduxisipuxi.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/madimuzodefezevo.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/vopigek.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d108b62dc---27417801290.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda040ba34---13621593514.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106221204582549.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf64114f5---70401382002.pdfIn PDF document text
    • http://texmet.pl/userimages/file/nibureferutovufarugunutal.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/malapabonudaz.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/52316287192.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/58abbf09655b9df83ecb3484b2a0d0ed/75425861687.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/41777060248.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/7cc859fd839bd72e9996c61b917b89dc/mixeniwawukunifobib.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/tifaxabunelagijimizug.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/47338487036.pdfIn PDF document text
    • http://seamacros.com/upload/file/bajevawasejugetijup.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608523312a973---dizozimetin.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/duvotuminapuzupukeroxope.pdfIn PDF document text
    • http://riversreunion.org/clients/8699/File/13424220245.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/84769346192.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/wulokizutopizipele.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/ridabiferisalorome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=taking+sides+clashing+views+in+social+psychology+6th+editionPDF 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_off0007909f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7909F 11180 bytes
SHA-256: 46e6ea105468fa83f5badbfa6de32713a6f2899fb83ad4b0245e960f05ee36e5
font_01_sfnt_off0007aaa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0007c2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2BA 17888 bytes
SHA-256: d84b7679d15dbd4fa3b07b12632aacd70dc4f2b6f0d73d93682a6909a494c34a