Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b590004daddd2c…

MALICIOUS

PDF

95.8 KB Created: 2021-08-20 02:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f18dc860fc9300d8d97e663e4116b13c SHA-1: 669c1108bd1402b348aac05229bba38dc99c97a4 SHA-256: d7b590004daddd2cf94eefc354f6fb7c6ef1d1c7142271682989a2ffc3f2db2f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links and the nature of the hosting suggest a link farm designed to obscure the ultimate destination or to leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://philabc.ru/uplcv?utm_term=meeting+agenda+template+powerpoint+free PDF link annotation
    • http://helloslow.com/data/userfiles/files/17310152453.pdfIn PDF document text
    • http://meechoktoolmart.com/user_img/files/lizogaxizapugoko.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/57384791496.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082480ccd0d7---93467770239.pdfIn PDF document text
    • https://medpressa.ru/files/file/pomujimoko.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9915765ef---degoxojolumagu.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f25e91edae6e890c9371f13cedec6185/96562502424.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16109f4b59773f---dotesuzagaxusepima.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/43956603685.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/tivomuxanimuxufi.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21099975056.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/pijazojujugexazewe.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f049e43b8e---34530928616.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/pefaluvuroji.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bc33799fd---32530638837.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/76473553117.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/bitiwetijowow.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d920c4c1---xetupu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86afe62347---12726539641.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088e7db01453---tibukezupuve.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/kebimikemakijedaritapuk.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/88044497536.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/vogiz.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/63262585390.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ab3400c9a---80618006535.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0475076b4---32848477614.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_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B23 17516 bytes
SHA-256: cc0f849f602a80ed512f55acaa51d2a4862024c1823b2055661208a100d8dc3a
font_02_sfnt_off000158b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B0 10752 bytes
SHA-256: 8d576e618d6e576835f91e84a33c6b59da67e27a48f50a22ad81072c3dbd79a1

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