Malicious PDF — malware analysis report

Static analysis result for SHA-256 da402e13fd569234…

MALICIOUS

PDF

69.9 KB Created: 2021-09-26 06:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3112d0e1d54136fb51bca96beeb7e221 SHA-1: 91671feba172970efc4577c7e5a8e74fa768f08a SHA-256: da402e13fd569234c2c082959e230605f27e9943a022cce98f9c07ce2d48d29e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=how+to+check+phone+screen+time+android PDF link annotation
    • http://stefanourso.com/public/userfiles/file/kabup.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021092607504240.pdfIn PDF document text
    • http://lgassociates.in/uploads/98135329661.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1614382ac04dfe---movemetipekupivodiwamas.pdfIn PDF document text
    • https://atl-50.com/files/file/94453510759.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/segefijanafojubexagoxox.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/02d7404a25ddc70507aaca3f77c006fa/58409508694.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/30431863129.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210921092605_84079325.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/52619581335.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/duxagabupumam.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/87008037499.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/xededokumabolajosamolana.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/87048692944.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210905073430.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/58457132742.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140aa68ebdf5---36102548907.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/77229293842.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/rigozu.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/jotorenufako.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/fuveketobolazozomawizike.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139d364c4f67---20275910227.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/55804384332.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/wodon.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/voriposomevexaleduminejo.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_off0000b0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 10904 bytes
SHA-256: adf3135673a649c033f848044fb82f6a11f4ad7e5ad83a9072098e46b14cb784
font_02_sfnt_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 15896 bytes
SHA-256: a7180ab91e4f87d8802ac1d6ce4904d47f5b6320adffaa6a809aabf9f82d9fe0

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