Malicious PDF — malware analysis report

Static analysis result for SHA-256 76bc016c36de6899…

MALICIOUS

PDF

73.0 KB Created: 2021-09-02 23:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8eefe97540354a55e7b3e259feb0347d SHA-1: 6d543255553508dfcec6f63dbcf6a56abda7adc2 SHA-256: 76bc016c36de68997076ef9f045bea046d389ea9e8a7acaf0f65e07f5b13da9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the links as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • 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.
  • 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 http://archiprojektai.lt/app/webroot/uploads/userfiles/files/62139979305.pdf In PDF document text
    • http://orvosvalaszto.hu/uploads/files/13456421461.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094fdbb800df---juvufatopemudinatege.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/28810183179.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe1e006318---vafelugoluv.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/58475042949.pdfIn PDF document text
    • https://cmetrix.net/ckfinder/userfiles/files/jevotukabesokup.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59f27607f2---25150844769.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bda91757---92258127396.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad894f518d6---wekabigaxabezeledava.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/99328093520.pdfIn PDF document text
    • http://kanstm.com/ckupload/files/11125838606.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091ede0b7b7f---xukabejedegavigesapijid.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/32026125721.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/pekejivubu.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/86786981495.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/zoradusavemewuxakimexin.pdfIn PDF document text
    • http://falerisztika.hu/tmp/28795762117.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/wobuwukotin.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/kudojuderekatide.pdfIn PDF document text
    • http://bmcsteel.com/uploads/baiviet/files/zozonip.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/84564349694.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/34973903390.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/xaburaxevebuxemozapive.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/tuwalebuvadi.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/47916410262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tnpsc+group+4+question+paper+2016+pdf+in+englishPDF 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_off0000b76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB76A 16472 bytes
SHA-256: 4cba8b37d97267772a7d1a0568f20b9be48e4b03e4f20ce2c6175dfd2c212ed9
font_01_sfnt_off0000e1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 11648 bytes
SHA-256: 0c602caa5b276a49e4658de3ea81edf47d11e98330bc7d677bdd48eb8f2c56ed

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