Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32aa979d6cb74d4…

MALICIOUS

PDF

88.7 KB Created: 2021-09-01 00:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 350cbc09359c895dfde641fefafc9089 SHA-1: 577993c2c21910fc0dd2e4441b1ad5d240895a27 SHA-256: c32aa979d6cb74d46c9aada453aa635c0ab8b2d977d7df34990f26d6340383da
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The PDF structure and numerous external links support a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • 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.
  • 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://markzone.az/wp-content/plugins/super-forms/uploads/php/files/7l6o2i85hnq6d8ub78j1kvrcnj/rasibolifobixupijinide.pdf In PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/43164761846.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/85638337083.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb12bd1f67---dijinuligakarasoraj.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/baketixijokivisileru.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/32224119541.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2e86debgkn8h0mfmjq73kgglhn/40704439896.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/34825518954.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/19939131278.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ietrmp47ra0p7od0mbqbh8fln5/kokepizimazemazokiga.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/korerunisigadi.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/91086812186.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/nirile.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/bagoremikojur.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xikaganisuxeviwufezob.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/97001673208.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839fd6b4c62---24153139508.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a469aaee---munebuparejofa.pdfIn PDF document text
    • http://jsdarvin.com/files/48091783434.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/wiwumifujuvibefewux.pdfIn PDF document text
    • http://techbis.pl/files/file/pojetaluxolokez.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210829_003315.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/vepatezujujewesumep.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/dntsdeotf3rpbh4gg5s37im9t2/gopubijasutipezojos.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/42318903025.pdfIn PDF document text
    • http://museeducuir.org/upload/files/rakuweli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=uses+of+aluminium+hydroxide+and+magnesium+trisilicate+tabletPDF 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_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC6 17204 bytes
SHA-256: 660b21657c075ddfba20f75609341f2dc1722af3bc6c02b59432832797b0479e
font_02_sfnt_off00013913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13913 11388 bytes
SHA-256: 1338c82b44022995b8fb98a66765653cc0e80cef5cef627dca83389256a01ba2

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