Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00a906cc9867fad…

MALICIOUS

PDF

84.6 KB Created: 2021-07-17 15:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5db6a4abe60228bb616d66f735d11d29 SHA-1: 4c1d2e4e68555e656e6624efd54330c8cf81fd7a SHA-256: d00a906cc9867fad8958cf5c9fbe0901b0113a7614f4544e19ee8e458a1a5ea9
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or download further payloads. No scripts were extracted, but the structure points to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdab206db7---60021261262.pdf In PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7d838e98d3ab5d92ad46fcacf99aa304/rupadulunanuketowus.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/jixexapoje.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/6dq7jb73373p5j509i22l7ilo3/47866355311.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/zaloriwonigeritovijatebir.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/pumaje.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/gadanutajexolefetiganot.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e0d779b6eede37513c0bcf6137dae2ae/jipixizibofuxavepamuloz.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608850340c2f5---nasena.pdfIn PDF document text
    • http://miele-service-center.ru/uploads/files/gelomumediraruzugolojos.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/cgclq1fanjddohh8fapccm3e7r/navidobabewasebabebateji.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a64cba53926---13514386211.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/20217131331511041.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b19de36006d---41769975355.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/b5bdb0dd683e697dc0e288c6064c3c9e/18060393149.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/sunexawuliv.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/xivevibajefokotiziz.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160716cba8d537---garuwuzup.pdfIn PDF document text
    • http://teaandtiarasottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/26493057933.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/gimodajepefa.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/74911586479.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c5a5591b90010dc2838c9b490388de37/jesujigarumuk.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/12922661884.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/ad6360fd873015881d5d2d7762a4e0ea/lunuferulobivog.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/48649888399.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/54699845114.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/883f462880c7ba142b419ee8d9d9301e/xidomigokanejumidesewasos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=free+printable+insect+worksheets+for+preschoolersPDF 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_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 10872 bytes
SHA-256: cc2dfc4af3c6ecfe95c5e36c86fa3975a99dde74426ead8270ea0ef15f3b1c6c
font_02_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 17508 bytes
SHA-256: 377aa67479dd60ba05cae0decb1eb77061129258165ed3e650279da138f8ba99