Malicious PDF — malware analysis report

Static analysis result for SHA-256 5567039c4fc97a10…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 20:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e84165c3f3260efba8af41d83b18e34a SHA-1: 933373062a2e48e59eaa6b0ff5796f7353b92286 SHA-256: 5567039c4fc97a106f1ea64b50cbe4284bb82b2b2e0407a96bc5318f025528ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=telecharger+pubg+mobile+lite+apk PDF link annotation
    • http://ccsl.asia/files/gogikigiseremexeweraw.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/4g8jas1uao0qf8ffiiv2b8tgmf/78688839258.pdfIn PDF document text
    • http://toonesk.com/upload/40016503295.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/80d3c986bb84000344f3fdc429ed8219/tapaxefet.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7ee01fbd5ba236db2d70e0961951f7a1/zujinetimemot.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/23824699700.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6dfbf1fa0e5b09110afa29434bb1a438/32960752927.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/sukutazufokedofuti.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/dobakuma.pdfIn PDF document text
    • http://fnathservices.com/upload/file/midunumosufalog.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/sivuron.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/57667750386.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/88153965870.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/rodakaxaf.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/55006918047.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/60362164082.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/88730411257.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/6295417185.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/68831367545.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/biwukozik.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/42319732206.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/40006491296.pdfIn PDF document text
    • http://myredm.ru/uploads/file/gikezawupe.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/32422058293.pdfIn PDF document text
    • https://tele-video.ru/upload/files/votegulisafaba.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_off0000bdac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAC 10844 bytes
SHA-256: 96d9bd3fa39fa996e90177e64162adf5e7b6b824a265a34f09b7317aabc61f31
font_01_sfnt_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 17540 bytes
SHA-256: 78ba2c24b5ef2c0f63a2a135534736015f6f6967e5f27dc1adf50b6daa252289
font_02_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1