Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a3bc2fc6e5cfdcb…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 21:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc99972473e12e92367631b67f938471 SHA-1: 31f2d777f8c58ebc5128de36edc44faf2088b3a6 SHA-256: 6a3bc2fc6e5cfdcb7f350aea2a94356afeae83949453c52225997a5985b49e4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://gyandeepjkss.org/userfiles/file/73387000110.pdf In PDF document text
    • http://galettedesrois.hu/userfiles/file/724544574.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca961648fb---jagawenavuwuwimolirajomas.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1ce066b8---32073708592.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf77d62011---87454904589.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/6761748cc6d8e54cad4d48be94383619/59320667281.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/qm56rj3v2vvpjukdsjgam8oad7/nobubituvaletekag.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/22022951753.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094b1603e86c---gagijaletapowulugexufe.pdfIn PDF document text
    • https://harom.ro/files/file/2009774603.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/jevixuro.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102d5cc3af54---91040104512.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/e1i9iqmlh9pk376t5tdktthv2f/venitu.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jobopimavegevixazos.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b404d97d7a9---94315736187.pdfIn PDF document text
    • http://strahyi.ru/images/file/35467014536.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/67978657609.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/52753064379.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/041cb8a80a6adc380932131c9de6b9fa/timomulokudakow.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/gikevedorusetabufijavupob.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/wuwozegulemomo.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/79388835398.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081c74984b49---88485020978.pdfIn PDF document text
    • http://hopkim.vn/upload/files/44015471938.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/64100322237.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105181202426900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kelsey+o+connorPDF 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_off0000bd4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 9976 bytes
SHA-256: c4bfbd942e78e44f2cf8b2a7e4d932668216b1976e25af0e8d836ec700e6a94c
font_02_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 15888 bytes
SHA-256: 62563a84c8cb56441b6f17662ffdbb4a1d5c4242457c49ea7e025b9b38f151a0

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