Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fbe730a6ec04d7e…

MALICIOUS

PDF

196.3 KB Created: 2021-07-07 20:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d9f1532a6263426d1e3c46e10a135787 SHA-1: 14da1eac8ba6a1d49791ba189ad55dfcb967aa80 SHA-256: 6fbe730a6ec04d7e256a9d90c94e839c2952ecd01109707c78467379034d22b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan payload. Although no scripts were directly extracted, the presence of embedded URLs and the heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggest the document's purpose is to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://verypool.cn/images/upload/File/somusobavelizidok.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a71bb33f2e---vojogodesibipaxopenaj.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a087090e487---pokubovipewigezed.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/bupiloban.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d308812445a---21848045144.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/b6b563dfce153c96b1fa2d879a21ee2c/72469072614.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/33301692151.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/gdfcmhsfctcj3ope1sldccnimv/34771517476.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ac58deaf101---puxuzetusuwupowe.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/jivazat.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/88527626224.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fd379ab77---gunetunevo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8fa2bb3b83f9bfbe784fcd276f2b26ec/57823257974.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfa1f04126---80683083728.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/35465636151.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160923d49d8f09---63758696159.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cc0a7ee1ef5cd7bf84a2cc7db35728ee/18030268395.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/60064497802.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5f690c4b156663cf114929e3f9f251aa/97636820902.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7f6408aee---8268418788.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/54279916253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+canadian+formularyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21f3a0e219---62076461031.pdfIn PDF document text
    • 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_off0002a122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A122 18508 bytes
SHA-256: fdb2a449740c945b532e4af4ac2c595900144d67ef5fc3b3b4d75b8921b1c787
font_01_sfnt_off0002d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D1B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E9CD 10652 bytes
SHA-256: 152da6ede99b6e8b9ace0b5ad0b2922ec404d90b7a573066cd6984bd0c8dedaf