Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a211f8f95ac278…

MALICIOUS

PDF

86.6 KB Created: 2021-09-08 09:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aed90b9bd994b94411ce3ec3c5310fb2 SHA-1: cd69169578b692e98ba88177ce235036a5860059 SHA-256: b7a211f8f95ac278981dffb98b2f3d85312fa7e522b642d3b5e85c606fb75ad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c11df651554---80463821229.pdf In PDF document text
    • http://vidol.nl/userfiles/file/xejumajuvibumetodisit.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/wubebomogiruworafaxuku.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/vesufetebukorawisibanine.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/4619228063.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/98496049981.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/95233507527.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/c28d3cfebfb50910308951c1b2405cc5/zidutabuvisevuv.pdfIn PDF document text
    • http://lookkorea.net/userfiles/file/kijezuvinukugimi.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c8a9a8706---1759820710.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/76518034930.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/dimaxezebixumed.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/20665698351.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/46507936090.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/21264bc1a9d594cbe7ddfeb89fe6d22e/98518494773.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/78617537126.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/talutiwekafezubeto.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/godinosugirinot.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5ef33bdfb7e3082f0bb307d0d053d381/selulukibag.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/df80b39c6655a3636a758af342e76829/84896034875.pdfIn PDF document text
    • http://www.pvvc.cz/files/53150797661.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/zepirogizigoboluditu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e16ae8efc5---godebofojorixugejajefe.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/watalajukigude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=vibrio+cholerae+review+pdfPDF 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_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 19388 bytes
SHA-256: 29bb3e9cd63fde740d77ebf269295a16327dce0b175493f35c4be8df1b81ac79
font_01_sfnt_off00011c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13475 10608 bytes
SHA-256: bdf69678eb2a393291aa581cc2525a072f4cc04b53bf14aad6cf6ad5dca52e23