Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d8eb3ab6d95e60…

MALICIOUS

PDF

110.5 KB Created: 2021-08-02 04:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 27b09d353e913227c21339ccf08d07c3 SHA-1: 39f42a07499c434bbf5492befa8f03f48b01e816 SHA-256: 59d8eb3ab6d95e60ca3b43e52a822ca93e69125ee274b48886961ccabf8fda9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jokerprod.net/userfiles/file/zoritukinufitoxawexava.pdf In PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210716/file/16264497882564.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/buvuzajewabibavumopi.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c921c2eae34---81801233404.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/ruh65gbeqvatc5ep479u012av0/863786994.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e3fa22a11c5ac552a7a270e355a2e8f5/49051373731.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b87b781058a957d285324312f392eece/10761057546.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/82952039341.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/fakapekexesid.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9b962c258---vagamimeka.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/poxokororizefuxojujusasej.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/44774057209.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/4393453841.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/masogodetobamuwuloradid.pdfIn PDF document text
    • http://abnicum.ru/files/file/josularuditisesikutuvob.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/21b9cbd859784accf4c013a477aab41f/zurate.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/vufisejediv.pdfIn PDF document text
    • http://vce34.ru/attachments/file/gijire.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/jilufakezunawe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdb494b64fb---mapesefilusesotutu.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/506661662.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=libro+en+honor+al+espiritu+santo+pdf+gratisPDF 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_off00014a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0B 10972 bytes
SHA-256: 4893e8b3d574bce54092d1f24e066a275784f069d00cb4928e96eb2ab6e6bdea
font_01_sfnt_off000162f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162F9 18632 bytes
SHA-256: 28a8c338b2889b6c6a87dc6022510e3e38182e77d6103fa2d641468f1c6210a2
font_02_sfnt_off0001923c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1923C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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