Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abd4dd536b2b3d9…

MALICIOUS

PDF

82.8 KB Created: 2021-08-14 04:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fa6fe99151ce183015a717519cd95aa6 SHA-1: bc9e08d91ef06898cfd514c892ecb5cc98031a06 SHA-256: 2abd4dd536b2b3d9c8a98707078ff8a1827906cb00cb4ed5e78c4a543c3b7e28
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs. Several heuristics indicate that this PDF is part of a link farm, with many links pointing to other PDF files hosted on compromised websites. The embedded JavaScript and the nature of the link farm suggest an intent to redirect users to malicious content, likely for phishing or to download further malware. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://krisoc.ru/uplcv?utm_term=coleman+hampton+cabin+tent+setup PDF link annotation
    • https://fisheaglesafaris.net/pics/user/file/3408663654.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/70c93f225b7079908caf525788c14966/14816265334.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/sokobaga.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ikdlebiefqsmi6ag1ucn146lbt/20061729040.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9068824c33---54746452992.pdfIn PDF document text
    • http://jingchengs.com/jingchengs/ckfinder/files/20210722193157.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/rusij.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/50245676760f949171c2fb.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/54292369942.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0nkm62qc8gi5e0g7133tcalpa8/34655293166.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/53120032312.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/5rrucq2c3g8shle0slq5h176kk/19352233321.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160bd766b1eac5---liruwodokurekelapowupof.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/pokuz.pdfIn PDF document text
    • http://prestopc.it/upload/file/34438418127.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/42369679044.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/lapabowuginujo.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/34261947432.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/korolapasitimorafafak.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f39aab0d61e---jirufu.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/0239d944d0d2c3fe7e1475e1dbd7818d/4403124281.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609805643c62f---48610459207.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/xipopoxeti.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/fadenerexiga.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/44946786394.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_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 15956 bytes
SHA-256: 793c0fd80ce1a861e5380fc71ad6120d8316b6c9f6f6fc3af0ef9ad36d474e85
font_01_sfnt_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 10808 bytes
SHA-256: 64a3fe9a695c8bdddb47c5c01489b3ac3e35319417beb59defde592691130f16
font_02_sfnt_off000124a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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