Malicious PDF — malware analysis report

Static analysis result for SHA-256 237bb41a7f6397a3…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 15:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2364ee534bd38e55cce3ff3a081ce2f5 SHA-1: 20f85ece8b7b1f8d0ade93172a64fa807d46a871 SHA-256: 237bb41a7f6397a3429dddb627b492b1403600aa215d1284c0020296a1d44e8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/sae6g2tu7adhhcmuhfour37h80/27924127086.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4c9a72626---wasujepexedu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b24f90de497---78128552044.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/501820972.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/31696003303.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/77183715971.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3ae1876222815b28dff413180ff5481e/13103689189.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/27338000792.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/sajat.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/11028380185.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/60585241842.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/hkmaeene6fgem6p6kal2lv4rhk/zakix.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/42257174042.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/13365996553.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abd3bb0a302---8204603017.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/xukutosozimozafozajobi.pdfIn PDF document text
    • http://aps-mes.com/files/file/65237874633.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/mutunizenutu.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/tapoxikamirexokome.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/28733062383.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/71122205014.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/zigosinamiregik.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/79334059987.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/1f96b4e85533401274207882bc1de015/tezav.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/28912253845.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/nezabetofol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=rovsun+commercial+grade+citrus+juicer+hand+press+manualPDF 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_off0000c5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 17096 bytes
SHA-256: 0ad3da12c18bb9fc01be601d46f2238f583d23108ed8a1aa1ff3ec093faad2dd
font_02_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 11300 bytes
SHA-256: 1c99bbe67505a590eb8ab841406d197a1c80b96f4e802238b97f252a77989194

Open this report in the interactive analyzer, or submit your own file for analysis.