Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b3ab0676adbe52…

MALICIOUS

PDF

87.8 KB Created: 2021-09-15 20:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0be2943e16497c6741191988a1e71d11 SHA-1: 89f2e9b85ce3491cc6b000bd4c5bb41c1c485167 SHA-256: a1b3ab0676adbe527879cf79ab1cdda72b19aee60942973b7081afafe56c1b51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. 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 0.9912

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://krisoc.ru/uplcv?utm_term=best+video+background+changer+app+for+android PDF link annotation
    • http://hotelbelleepoque.bg/userfiles/file/26251485702.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/lojofifazenaka.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ffd53a4d6900676c5dcd8ab4ed33cd67/sefesavodezeleveg.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/85975134699.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/88831065414.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/18582894450.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/notum.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/damojoge.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/76066988453.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/58823526382.pdfIn PDF document text
    • http://tochuchoinghi.org/files/35179274763.pdfIn PDF document text
    • http://zenithmetals.com/files/23831146198.pdfIn PDF document text
    • http://ttc-investco.com/img/files/votafakenululawu.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/82645235762.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/lizubukituwodijinawugabo.pdfIn PDF document text
    • http://e-sheremet.com/img/62976525731.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/55807093625.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/pekunote.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210905195230.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3fcff14378a68f9bf4316ffe67084fb2/39141501560.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/88530007565.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/67637398664.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/jilezuvegob.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/binab.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/54543028148.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d55eb0c46---41438429290.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_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 11304 bytes
SHA-256: 2e77a2591c2da0b6c9a8beb62ed89225bd1e8d7026e1a98bdf562920b9f95606
font_01_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 17640 bytes
SHA-256: ce96b4e7fb0ed8a97dae84add16a45dd4fc4490f7a80fdbbdb25b624501036cb
font_02_sfnt_off00013899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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