Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb623e77c46da059…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 02:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0e5c8ba5701887a6fcb76bdd5f20a1a0 SHA-1: bf2001ee6e9d4f30949a3a1ed385f2e7cc13e461 SHA-256: bb623e77c46da059341bffa991cc18f9496c8955a83a8e78ed1d4d8d602a6d1b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicates a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://luxesystem.site/js/ckfinder/userfiles/files/pujinefonurajipenofiwi.pdf In PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/lagedatutu.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/06b304c6ff861c61df5305ab5c879757/dopexe.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/92067987880.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/68510070240.pdfIn PDF document text
    • http://familiegravesen.dk/userfiles/file/15393787461.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/gawilixomugomazomigajepu.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/91055171653.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/78176722080.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/bitodinomelomiganesotonu.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/84328039640.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/zoterenax.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/vctdhhtf0vorjl4dovok8fp82g/5121465733.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/luzuk.pdfIn PDF document text
    • http://ebus.cn/up_file/file/xuzuj.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/99768809432.pdfIn PDF document text
    • http://prota.ru/upload/files/tokebupozi.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/11522419185.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/96129594774.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/73831754488.pdfIn PDF document text
    • https://onlinendttraining.net/files/juzezakurulu.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161443a27c289e---28749657986.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/63538591834.pdfIn PDF document text
    • https://davaocarrental.com/images/file/nolar.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/72222258368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+set+a+live+wallpaper+iphone+xrPDF 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_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 10592 bytes
SHA-256: 23768d350e3eb09aa2ba991a3071d0ffd09b75ae3a0ee8fe9cac2bd9ba4844aa
font_01_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 18520 bytes
SHA-256: e737ecf0e122ad1ff8b23069d70f8d22a1e1833a4f250668faeab378caa9ffbd
font_02_sfnt_off00012789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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