Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3cbb70d1358d98…

MALICIOUS

PDF

86.9 KB Created: 2021-06-30 08:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 521b4e1a5b8f04992ac407ef7b8447f7 SHA-1: 6953be2027e57d8e48c2134ceb9a84c18de1ecaa SHA-256: ce3cbb70d1358d989599977cd3b3e3b5a9fec40616f45d80d17accf7f050cc75
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF document contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and a link farm structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27bcb1bab11134360a72d6b6e9a871e6/89290849688.pdf In PDF document text
    • http://yejida.com/userfiles/file/ruboragafegotabuv.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/78459303488.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3tjdd7s8c4mflnktol0mlh1sk7/26566102180.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082682b66e00---wadaxoxaguxusalesagi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160838ce97133f---45958424090.pdfIn PDF document text
    • http://nktrading.qa/file/files/widatejute.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/lagonikawezoxenobex.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78a4309a4c---36449157092.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e3eba3e9---mavolejusikurete.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/qbinummv865l3tcroe3fsrmgr7/luwudun.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/2b17712c99c88f4937377d211c83ae8e/dodegitukivobe.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/429bf2725dbc1615f3c71f90e875345e/tebuwisaxagixeguger.pdfIn PDF document text
    • http://accronline.com/userfiles/file/wijokadexe.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/idk9gm020j26r6m6n5ggi26r02/wuguno.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/36174e59a85bfac4ee03ec75c3ea5889/retaxuboxuzakirawudijoran.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7lboab21b48ilhpqslv1hjp4hf/36245751118.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/muwejewatabulunuw.pdfIn PDF document text
    • https://soechi.id/userfiles/file/femakesavuz.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb410ca4533---xibezo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f6603839---jasakezezefav.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160897d8d75f78---wozikotagigawerex.pdfIn PDF document text
    • https://alutat.com/data/file/pemukogijijexejofexu.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210606_4E6FFBC240CB2445.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f73b77ba---96411830921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+install+apk+file+on+laptopPDF link annotation
    • 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_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 17608 bytes
SHA-256: 9070790773713a5decc53e419f8a9524f16b8040aeb38c02e670c12db690ae23
font_01_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DC 10420 bytes
SHA-256: bc31b2273a6c533f6b092849d58c2bc501a2ac944cee355810f6c8e559c22980

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