Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bdcdcf6fbb1504…

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 10:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c58a8b7325be721d81c4f4c0cc48647b SHA-1: 9b040aabe1ac3134a9a10f6556991564300ba9b5 SHA-256: 18bdcdcf6fbb15041fd8945c64fcc4e69f11c4bb411b13bfd4cefde2e0b68c20
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://krisoc.ru/uplcv?utm_term=project+report+on+marketing+strategy+of+nestle+pdf PDF link annotation
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/94d012bbdbf4dbb5444c2ec21a3491de/dojavokise.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/mibiwimosotusomeroz.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16088035dd62b1---lukizu.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/83191589012.pdfIn PDF document text
    • http://jucal.es/images/file/vomugelegijitezefemo.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/95286626066.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/689e96356cb61a023efbab45ed2f3859/94410607589.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/5927621862.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2ae8fe52---18860783048.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722263bc0f7---muravafog.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/58709183068.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/tadasi.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/56413372136.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/88141826820.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kolawinaxumolala.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/85214469544.pdfIn PDF document text
    • http://kleni.cz/userfiles/file/20160438696.pdfIn PDF document text
    • http://kahasat.cz/data/file/xinafukara.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a89424736---9257876352.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f61c0fe6d---53431141529.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092099bafcd4---56004655538.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9d2ee705---satijor.pdfIn PDF document text
    • http://unseretochter.com/images/file/metotavove.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/41255544238.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_off0000c6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BD 15996 bytes
SHA-256: 9b05c690ba4bdb6de6d2f7df98fa0a67ef2dff5c7945755dc99bdcf8389a9700
font_01_sfnt_off0000ef2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2E 11300 bytes
SHA-256: 90edbd18a6b28d681bef27683ab3b9856735c47b1a6bdaff7c0206142acf6492
font_02_sfnt_off0001098a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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