Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b26e3b0e026296f…

MALICIOUS

PDF

75.6 KB Created: 2021-09-04 03:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5692ccc5d9f238fb61d11c560cb5c647 SHA-1: 271d5d55fdf1a9dfcb3afde25e49067e7676fda8 SHA-256: 9b26e3b0e026296fb3ff010c24a75085f26d5876bae2e813709cac7a89e13ec3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites hosted on disposable or compromised CMS upload storage. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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 http://www.cda.org.hk/ckfinder/userfiles/files/81674261997.pdf In PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcbb5148b3---dovelulagikulinexaxoku.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/96691284075.pdfIn PDF document text
    • http://jljemc.com/upload/files/98296122240.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea63df2c4a---79824837893.pdfIn PDF document text
    • http://merwepizza.com/upload/file/wuganovuv.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/4256588878.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/mukaviwulo.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/lemibaluwase.pdfIn PDF document text
    • http://df-2.de/images/daten/file/fasolikunixudanu.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/xomonuworevetopekerakoka.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/87909773565.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/febegibosekenoruk.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607170bd3475a---11511424370.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lm01p7djpm5r1l21kldagvhucd/44878223843.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ba2qoq009s33igso6ca7te2gd3/buzafi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/74042110547.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/20530756546.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/bulemoxewopegita.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/luzodapizak.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/94931296948.pdfIn PDF document text
    • https://fuoriscena.eu/file/taxif.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/91517507405.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c7271a4e4ebd75f24ca975402f85bf03/gewelubafobebamosa.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/83022213956.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/mijoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=maa+durga+ki+aarti+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA32 18572 bytes
SHA-256: 691f9d16655aa9c04fdaccf639273688045381148297ec370208cb76434325ee
font_01_sfnt_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 10288 bytes
SHA-256: 02b853edb26fbe1d4a150bd2fc99e7c44c3adbcb2a19ed6e0932ef21bc420346
font_02_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc

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