Malicious PDF — malware analysis report

Static analysis result for SHA-256 f77ba0e08838fa2d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 05:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9a9db1211685b32814e2bd81f8d7a1f0 SHA-1: b0df3ee8ebc1db89245c6b8da41cdbe39f330990 SHA-256: f77ba0e08838fa2dd281ed2b40080db7cc38921475fecf8ee65e170e9de853e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=agenda+escolar+mandalas+2018+pdf PDF link annotation
    • http://kaies.cn/upfiles/file/25890612018.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210808015015.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/61476560705.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/69578107720.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/68151911942.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c12b7d701---fefubo.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/14397043516.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/63154235939.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/wukul.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64639316649.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/sapixekigibalaf.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/42756362670.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bb2a527e---14560905087.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/libaruxe.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/kapilel.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c9be42741---xemefexesopube.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202108310253113927.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/897a702c6a28d9c4236d3304f6edcaca/defeku.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/95649920033.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e6c167251---zokonuvemenajadizeli.pdfIn PDF document text
    • http://zeci.nl/im/image/63018672869.pdfIn PDF document text
    • http://apvn.info/userfiles/file/kilofuwitazerunibuzarog.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a72fa73cc---20542670965.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dad9938fd8c---17209253161.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b51c03830---54312000861.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_off0000cf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 11256 bytes
SHA-256: be90cde8c56ba9af0144ea51e35cba182e65f2d562c8a4f40773bd596efac1fb
font_02_sfnt_off000101a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A3 18872 bytes
SHA-256: 2e5c5bf2a8b73e21f80ac9306760b9d829e243514b551e708802bd8426244126

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