Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd407d640c581340…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 00:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2c552f9ccdc8090b1e0c23dd8b2a5567 SHA-1: 6bbb5a8c6116134d4a554bbf29b8bf18622311cb SHA-256: bd407d640c581340ff3c2aed35bd6b1fdb1153c7dc2dcdc18c866368c941d5f1
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=naruto+to+boruto+shinobi+striker+download+apk PDF link annotation
    • https://santaclara.com/wysiwygfiles/file/ganaxidufonuj.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/xagotobozinukebiminanut.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/25588719776.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/wanetuger.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/96293047502.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/bopinabisowajemaj.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/89568527357.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/kenokukusuwina.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/f3419ac4812cd47441a04d9a0a662658/vamewimugokinelozekesu.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/lafuwowivavexaxipak.pdfIn PDF document text
    • http://asqcert.net/files/files/2188572814.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210912_050745_9735.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/59008678610.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/zugotubawifuxawose.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109021809092485.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0690a8c6---17783044152.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/66cd30dffeaae04e81684e54e9a7b7bf/lirisojepupekib.pdfIn PDF document text
    • https://network-italia.it/file/4078486347.pdfIn PDF document text
    • http://metapolar.hu/tmp/kifevofarulipozowamowojix.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/47184218555.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/kunuvazofod.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/fuparomivukupax.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/fumovexilawiwere.pdfIn PDF document text
    • http://innersolutions-uk.com/file/bakakomujoganabugiti.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_off0000b2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DB 16112 bytes
SHA-256: 0a98ebb7e2a7295f0d463e689f4267a13b9668624d846ed64e76a49cc51d4c4f
font_01_sfnt_off0000db9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 10884 bytes
SHA-256: 3e0e8deecd9eaf0789dba2f8b04d37841007619961ab157504b4ecb8689d9e33

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