Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c1c7e99684e087…

MALICIOUS

PDF

85.1 KB Created: 2021-09-01 23:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aea311863f3661a887601ab1e9c4873e SHA-1: 49025d02a3321d82704ac4a19d7eb6724a438aa3 SHA-256: 09c1c7e99684e087b4d1c87d0385a4656755d53f57083cf448ae33b70a4b0f12
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and other disposable domains, suggesting an attempt to redirect users to malicious content or phishing pages. The document body is unreadable, but the heuristics strongly indicate a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c7eddb6d1---kozajonoratate.pdf In PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/zirimupenoze.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/m1qbuu3psdal702k9k7u0qkemo/47020922699.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/11349619142.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/93021657009.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/47824092661.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/07345f909d6126c812ccc588b2eac748/12209056050.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/23313651512.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/99832918220.pdfIn PDF document text
    • http://micruts.org/userfiles/file/43823171173.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7193cf0a02---xamumipupob.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/megenis.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/kovituloza.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/bovabokiwilam.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/071c15f6aae490b78a4ca7d342b35077/64209389033.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116122d94458---41636092770.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b20654dcd62---velizefuwulikaduzigibumi.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/bd6f0642fc9da40f9bb632156232ebb2/fivapisoladusurari.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/fheh9ka7g5rlpamr0ja5o8rmoc/puxitudosus.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/duwumikagewegozaminamera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=narrow+span+of+control+definitionPDF 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_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 10676 bytes
SHA-256: 5258ca8ab561d74db78e29f70aafb7a0f7f8b353864fd91d727bfd3211866a47
font_01_sfnt_off000101c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C2 17588 bytes
SHA-256: a7b89a0847fc8439dcb8c8ea8ce24d1b5652dcaf4b47f23d148a240ecd792155
font_02_sfnt_off00012ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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