Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d90835fa5e801a…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 18:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9ae6c7027803176984a2411c2963a6e SHA-1: 4df1e004cbc8b50e1921de323dbfd23cb8f95f30 SHA-256: b7d90835fa5e801a6818c0b2082fee8433d7e2c7d7c6d354aebc42f0153078f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://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://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_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
font_02_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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