Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ad91cf769729c4…

MALICIOUS

PDF

76.9 KB Created: 2021-09-18 07:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c32aa05860ce2a569fcf23ff971535cf SHA-1: 94910e709767e9c2604d96226a71fe2f4789f253 SHA-256: e2ad91cf769729c4539113a0b35a50c59a57d6c6fb04916ef57eb2082df6ced9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://t2sc.me/userfiles/jajuv.pdf In PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/zuwanejemejogewosegos.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/muvulu.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142215d2face---sowug.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/govorazonajexe.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/93702746126.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/10253408969.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613beaf282244---dawivesexuvuga.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/jexiboxaziw.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/vukir.pdfIn PDF document text
    • http://kco.su/userfiles/file/17927302883.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/fefupabiluzugajudaf.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/sedojukadowigifevupupesin.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ddb962ee0---mefekiletew.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/xafuxevobonawap.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/32855454614467ea8d13a.pdfIn PDF document text
    • http://mosjob.ru/images/file/56047872767.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/rejuxowe.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/62799993451.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/18684692225.pdfIn PDF document text
    • http://agilesolutions.in/uploads/55196057369.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/kudabu.pdfIn PDF document text
    • https://polaria.cz/images/file/jenesetunuzomir.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/fokudaxabafemuzavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=shinchan+ke+new+episodesPDF 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_off0000bfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BE 10620 bytes
SHA-256: a68a3f9461d4d59b922a117b22c8cceba8bff410c48c20097bdff85562d1d02d
font_02_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 20952 bytes
SHA-256: b9dcbaeb0e38b05492a967a936a0250127cdd69184d3c97a1ea442f78da25f39

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