Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bfb9cb35047f33…

MALICIOUS

PDF

89.6 KB Created: 2021-09-17 15:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2d27c8dc4945dd1a0e4a898e7555456d SHA-1: ccce4f9ff83f1c18bd2fc69f3cab954f6a621b46 SHA-256: 38bfb9cb35047f337812278942bdc3bbd0f09680301df4c7ec15f888ca259873
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=g+five+mobile+price+in+bangladesh PDF link annotation
    • https://marblobathware.ph/app/webroot/img/files/gatufuzipura.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614299430855c---gufumatokujukunuwe.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912ecc17e2---39761509256.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614097ad962d1---76045040982.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/67175474037.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b430ccb54e---mepuxifili.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bilixajuwebew.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/81453021628.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210906231842.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/6b5e5d5884d69451bddc8a42f05d65f3/81147184059.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/miruzemotajovolezopoxig.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/zowojolebetobomudu.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/62317623236.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/71473592235.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/60913667418.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/xokujejarinarojerovul.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/zadadepe.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/f1123bedb52d0051abed1aa3dae0f489/xerugiwox.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133029077d88---kazagajakazalumaxosimeb.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/88280699176.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/97867822382.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/26842207738.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/31152433781.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/bosonaxotiruma.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 16580 bytes
SHA-256: 699b0182330fd09d355f336329d48c0249e41810e183a084d8f15e161d5577b6
font_02_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 11216 bytes
SHA-256: 8b2328ebee6d99d0528b30b4b9d32af372d88c9cd17b96e74121ca2e9c0cf4fd
font_03_sfnt_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 21996 bytes
SHA-256: 143b24017122a711ca46bd952ed117dda28cb8dda60f020b9edc7f1d27f62f84

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