Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0325ae1efabfea…

MALICIOUS

PDF

83.5 KB Created: 2021-09-06 17:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5cb4ce8d7c8524c09558e007f7f513e SHA-1: 16855e6fc76b404b0e6fd0162325ad495b0d7d0a SHA-256: be0325ae1efabfea0cb2f856a936e927263d8e1e52e9e7d112fb3e126ca86bf9
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wastran.ru/uplcv?utm_term=equilibrium+statistical+mechanics+pdf PDF link annotation
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/373b6aa534f2a709f919d73c7a605999/94701568464.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/80180379239.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/72040e2d69e87a7dfe360aa520474329/76212005314.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/fogowapapunef.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nusowe.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/6116693223.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/pepopelofetomegak.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/libesefewodolal.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/83083324199.pdfIn PDF document text
    • http://24cvety.ru/upload/files/79320807666.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/jd9vdmcqa78o219pgd3in0tkue/kunidolezitaxos.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/16537741596.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/kagodevutoja.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/pojigubebiw.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3651a6d49f---nenizovaporon.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/gezubujebese.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/bolirunebezesopotepakesa.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/27234044508587ac0f3eebdd42e6cbf9/mulaxo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b677e4301b---sudexopazozex.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/fcfdc7f94879dd8d2bdaccb6efbc27e2/titulo.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/80660867229.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc04fcc7b0---75484284045.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_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 17928 bytes
SHA-256: 9de81c2813150af12ba0b1c69c7e3e991059806122a32905733443e6beda6d92
font_01_sfnt_off00010e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8C 11136 bytes
SHA-256: 7a83c552784ea1502f7ac79da6d5bf91a35bd255eee465dc7238bb611a6ac2d9
font_02_sfnt_off000127e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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