Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9cf3bb066011af1…

MALICIOUS

PDF

80.4 KB Created: 2021-08-21 14:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 54ee3ca055df6ad02824c502f3e8338a SHA-1: 00217c24d15edcb7ac1bf9553c1e4ad5602e829f SHA-256: f9cf3bb066011af1bf04652da1742fcbec18a3244352f627d59722746d2779ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDF files hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0a90ba66---1756352245.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/eo9diq6i72bo7tkljcr8i0mgfk/75113746054.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/49163874482.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/vomevi.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/66266347600.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/02a3d6f749702845b2c87ae8d953a5a9/2613746478.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c75d3610e---zibijifagef.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/91287202352.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/67461501765.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16085796a310cc---75574118387.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/76117819393.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/ffae7833df348204e8aeb93812c6e197/9036376018.pdfIn PDF document text
    • http://erpos.sk/data/files/75426235242.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/66e22b78e5fd211dc7af17a9d1432575/61417740366.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074579235eaf---20792143808.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a341cd7f3c1---mumurasapafogevidivamesum.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/52047363470.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/tilibidifapi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/jubafupinimuvo.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/74682220969.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210623073119.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/bqhblfd5idurbble5ash2cf85c/10986757283.pdfIn PDF document text
    • http://thongthien.vn/upload/files/27729018049.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/pidiniwalukofamegevafemal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=girlfriend+bigbang+mp3+free+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 19076 bytes
SHA-256: f371726a44ef57570b7b12e21c677d86c50c36ad1eca15dcd9b42ad7127046d1
font_01_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_02_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 11012 bytes
SHA-256: cd1f9709577e371f33594abdd473ea72fad272f0af08756393c6c0e448139b54
font_03_sfnt_off00011a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1