Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d79773daab7dd8f…

MALICIOUS

PDF

62.4 KB Created: 2021-09-06 18:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2b07e44cdb74a55ce331052105287857 SHA-1: 9b4f52ba571617b3cdb14566c4c17a13871a3c1c SHA-256: 4d79773daab7dd8f1f74b051315c7e7d95961be53be7814bbb1f657721eb77b7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=ucits+v+directive+pdf PDF link annotation
    • http://marchmont.ru/imgs/file/89944466494.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/vidapetupujerifekokuliru.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c97cb93f468---23680954647.pdfIn PDF document text
    • https://x-software.cz/data/file/bofufagek.pdfIn PDF document text
    • http://muslimofwestbengal.com/mwb/editor_upload/files/sedewomuwix.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f383618996c---vatidadutusawetula.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/cgg3uhlrslb8neklt6m7acun74/zikexijutimisagemugode.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/57890509939.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/bolabebilati.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/bkvpval6ui9ru2u3er8hgdg6n6/88283565953.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9d528803f36c1980eb33cc38771de8e9/pegibogubuzap.pdfIn PDF document text
    • http://fullx.net/files/93244186690.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cae6eb8b4---7349412582.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a56fa85a81---1830457666.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/gewekaxuke.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/mudajosunixagolosubis.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/takowarokoxepa.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/82109053547.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a0de129cdb1ef9e839df48d042aa55ea/61196719474.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/47c13079dcf92925d9c2edc5afb3534f/45529559507.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124bf9565403---23525367471.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/49986956824.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/75fbff09b0b844d8e7e5fb4d2c7dabde/50920754680.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/95170110308.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB97B 15976 bytes
SHA-256: f4e769826a6e28ad9739a32bcbf66867f73c71463bd67cfc78008b73d9e11fc9
font_01_sfnt_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 10252 bytes
SHA-256: 38a9432537d48d802c92227f5c93819688fdc997bb2dacc8a144eff5ca6ed851

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