Malicious PDF — malware analysis report

Static analysis result for SHA-256 97be5c92ed70539d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-14 10:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: edd0b0bac4a53cd801a64a1c1068d791 SHA-1: bf5fab4b913efa2ea6b726c3229caef1f1031297 SHA-256: 97be5c92ed70539d84f94911e35dd0ba1b7aa7c5a4f67c19f3548388f29ba9fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which appear to be compromised or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://catamma.ru/uplcv?utm_term=what+are+the+three+most+populated+countries PDF link annotation
    • http://giaphatmed.com/upload/file/lewivi.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/tudalanarapuga.pdfIn PDF document text
    • https://novsport.com/content/File/zelofolosidukafisiwaj.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/zidosovunopafejanagudav.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/15597769812.pdfIn PDF document text
    • http://asvpp.fr/pdf/konimufejope.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/25584862093.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/6379350488.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614009180f2c1---931490134.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109100711324326.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/10257289043.pdfIn PDF document text
    • http://bakoca.hu/files/file/rexirotamizerejanaliziru.pdfIn PDF document text
    • http://52963566.com/upload/file/202109011754175330.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/6ca92c5202539882f244aa4a3f636d50/mulileve.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/danamadafowotatu.pdfIn PDF document text
    • https://megashina24.ru/files/files/90653670736.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/44106119627.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/57182121423.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/miwuwajemo.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/49531420005.pdfIn PDF document text
    • http://maulich.vn/attachment/files/kazowabeviri.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7a23ec548---gekaxajidovoxa.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131471fd45d4---zubezakuwavofofuremufaz.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/wewujasejatudete.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/60877320330.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_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 19344 bytes
SHA-256: 3fc906968397530db6f9dafb65b9080e3e7957ae8563e47ab6e61e6d34c9dedf
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D45 10872 bytes
SHA-256: d8bfbb359c644b56e766b2b2542553aab28d2caa5a55bbbf9835e6f13970bdae