Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7549dbeed8fb4fe…

MALICIOUS

PDF

76.2 KB Created: 2021-10-10 06:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 7c60cdb745f4edd33a5ab6e96988843b SHA-1: 69e28c2ddd33bf2d0419f410d0895d1ba71a9f57 SHA-256: d7549dbeed8fb4fecfa74624ea4242addc0edd19af06eecd39d439636f1ab5b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, with multiple embedded URLs designed to redirect users. The presence of embedded JavaScript, though not explicitly detailed, suggests potential for further malicious actions like phishing or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=will+going+to+pdf PDF link annotation
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2fkjt1m6c65qi8hck2u62t8f7a/piliwanisibenuleberisek.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/fobimufukaxidikizoxomaxir.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/16900146465.pdfIn PDF document text
    • http://signauction.net/userfiles/file/kufakexukaravebiwil.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/lapol.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/34872552867.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/67000232124.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f0e5bb69---79203505874.pdfIn PDF document text
    • https://qematalsihha.com/ckfinder/userfiles/files/57216814088.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/kedozivonikavawof.pdfIn PDF document text
    • http://jawarakreasi.com/file/benefakasa.pdfIn PDF document text
    • http://vodnik48.ru/content/file/xunibudevogikosol.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/45157799436.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/rojozokutivurajip.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/41157254045.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/51572626319.pdfIn PDF document text
    • https://thietbigas.net/media/files/15847636555.pdfIn PDF document text
    • http://balatonfurediallatorvos.hu/userfiles/file/duwif.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/larufejewufakivim.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/jovufobesomavufaxur.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/sufadomusenugesatip.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/16852017387.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/f3663883ba2aa9f5960452a51a328464/ralutifajatajipa.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/bogifotawese.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_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 17140 bytes
SHA-256: 6fdc8ad0a7e8e26e53afd5fe58ef5d393b430cc810e8cc4f14e094c8a98e1643
font_01_sfnt_off0000f531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 10104 bytes
SHA-256: 271d56eb940f47434e351b13edfc487cc79fca07830e2e69c518f42f26f37c6e

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