Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7dbb7584634041b…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 09:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 48c5fbacf006022932c77c8a4acca2a5 SHA-1: 3296d381553f65e15c6611bd5efe98b869442e2d SHA-256: b7dbb7584634041b702cbd748406b4e0529f0092b58795697735aca592c3bb48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://techsystem.gr/data/uploads/ckeditor/files/vojelobasafugen.pdf In PDF document text
    • https://yuktogel.com/contents/files/ginilifizo.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/37098248586.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393547704a2---10990963431.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/35513808180.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/67907293159.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/61809014755.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6a6f153a2---75815169547.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/gikam.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/suxibusoditenutixip.pdfIn PDF document text
    • https://trainova.com/userfiles/file/zovekotaretenuje.pdfIn PDF document text
    • http://zimmerei-possert.at/tekoxo.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/rijuzovugokoboxafetadizo.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/miwufulutimemutuwosorexiw.pdfIn PDF document text
    • https://soechi.com/userfiles/file/tizes.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614b440a22deb---tesotegulubosikilesowovod.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/noxujofaxawotezoli.pdfIn PDF document text
    • http://eva.am/files/51e96577d182c36e.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/sositikikojebamitipux.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o3nsrrfah354ktpenajqb75ns3/84007194925.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f6b72138f---84571488864.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/43024491750.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/88650782971.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/movakanajakunat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=drag+race+uk+season+2+episode+7+watch+online+freePDF 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_off0000b02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB02A 11348 bytes
SHA-256: a201abc9f713c4984d7682ab89c14183a7bcfdb91e4dc8e49ab33ba09683641a
font_01_sfnt_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 16628 bytes
SHA-256: 6987256719b3f64c19684704bd2ef88eca94f3cd5db42693ddd5e9d623bae1ae
font_02_sfnt_off0000f3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1