Malicious PDF — malware analysis report

Static analysis result for SHA-256 d91632db09243880…

MALICIOUS

PDF

85.4 KB Created: 2021-07-25 14:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6167e6f539e6dd3aadb8eb88a24a3918 SHA-1: 3c140abe6bf09a54e6cba0a911f253d0bbfe65cc SHA-256: d91632db09243880316d8f3d59468017660d651720e80f615fa1fa5b7236a3d8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160823fa9e10d2---lapogepatojuxojadumoga.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095e3957b9bb---diwafetunoraroj.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/biposevikobe.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/vuputogudidatukuloxefuka.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/16762834711.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/11728361414.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/navajitasiju.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/bafejerimuwav.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/bfdccap13uomeqiph3udh62hbc/bobofovimiziwotumo.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/74206303752.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/93805575261.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/nobobema.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/ec599f78df3534cddf3c1251f973abdd/20144018624.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/71064812381.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/37028251945.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa306d1270---sefozoba.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/47973473761.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/keguxuji.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e7edbb8ce24b4021cd447b7e6ab9838f/saligojalujuj.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/furebedikeniboxuluta.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/58955394540d9cc67dcfd8dd5baec93d/gaxudekesevizaxapoduwe.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8e727fd88---rigojelo.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/4hfvvon5comk0mn8jb8bb159ri/42265865111.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6c61b119f---jirizerowiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=medical+biochemistry+multiple+choice+questionsPDF 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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 11272 bytes
SHA-256: 4e17b99e559a81428e0880a3399a8c2b01d5476a19a9ec37af4edb887ea28854
font_01_sfnt_off00010036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 17664 bytes
SHA-256: 657e5643af8284476c34f54a8c23950de21f0f6a4703e910c72f3617bb4412f4