Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d9c493e24060cd…

MALICIOUS

PDF

87.9 KB Created: 2021-07-13 18:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d13b40621edaad58767ed6a8f53c088c SHA-1: 7aa1988156daa39818bfb1bd5d00cf42c0b72e71 SHA-256: 99d9c493e24060cdb9f6e999c688664b559e40d9c2dc30b76e3285a720be0fb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous external URIs and link farm heuristics indicates a high likelihood of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b9942d7c4---17896663409.pdf In PDF document text
    • https://chmelo.hu/sites/default/files/file/39255567481.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/f9d35e56cf5c397600597f51590df0ac/tugowo.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/31180dbe673d9c339a18be73b8d8a369/bumiwolopa.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/860b88cf2c46ac364e9400ae590717eb/32196514604.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/rodes.pdfIn PDF document text
    • http://plncse.hu/php_data/file/nefulimarozosag.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/gp3o11fqg7ue6emd0c0lgk44a3/sijegolugirej.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d608fd5c909---43638404009.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/m0ern75qip1su755kcnlkij066/45008823261.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16088bc1b6f27b---59912343050.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ac88424a6592e8ac956da22295e2a610/pezetinilaxaro.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021060117451673499.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/18952580455.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/d8e79f3840144ce12b51f97db6c67c5a/vapixilimurivif.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/rcrd6pqku8nrtduvmdfuv7ds51/kenulode.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/40558035893.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/314f2e786d1b02c6134523822d18c63d/sifugel.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084215abfdfb---30215821259.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cedab7d5271be29da588282876fb62e3/75021359334.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16081148fa31e9---nexugozidazuwekufozudo.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/mio4ug717uftuqt17r63qjerbm/dozino.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/9ff39cbb0e941481f41d86c27aef392c/mepiledenisenowi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/384cbe8d42ca9674cb49359c1ce751a7/selad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=2+baby+teeth+fused+togetherPDF 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_off0000f5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E2 10768 bytes
SHA-256: c1edfc670a516a44d50c2c051295031b1542813399f18263e59587e3d160c0d9
font_01_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 16920 bytes
SHA-256: 74bcb3951e7128e112b2edd2e96367d029a09a9a88aba8746408c2f1fb62cdda
font_02_sfnt_off00013a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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