Malicious PDF — malware analysis report

Static analysis result for SHA-256 6161679470ed86f0…

MALICIOUS

PDF

92.1 KB Created: 2021-07-28 06:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 67fea117a5c403f011aaff9d1cd7c9ad SHA-1: c848c2ce81fa46b8ca42521a82c5a739e17fcc6f SHA-256: 6161679470ed86f0301a2596ad168ccb8babb3b020c22a20bd7d3104f3feffb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nadamasristorante.it/file/83275113723.pdf In PDF document text
    • http://ct-tci.com/cttax/userfiles/files/67597334689.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/53967946495.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9521275149---dojajusoxa.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/e55c07402612931e61d3703860152ba3/26926924077.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210706_B1C0D9603ACBB616.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b121b06a70c80e8a3804cc5328776036/zawebowimedegutob.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c545849dc5---46895712711.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/83503998696.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3af65fab4---kopowodusibav.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/filup.pdfIn PDF document text
    • http://yaheardfamilyreunion.com/clients/6/6b/6bcd2b4031d0b832efcfffe4b90de728/File/39956510165.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa35b14a0f---moxopozirisisajowanux.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/23304474101.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/2715076409.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3771c871fb---xizuputizepipapos.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c03dbc467eb---50461434553.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/4526882040ae0a111093d5b0ba698613/68100986975.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/51949642336.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/f7nd1ef8cusnibj7vtqbc070c5/24128182711.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/buxumolilalutekalonoxuge.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0195626134cad4b8b8cd96fb3f08d8ad/19665292744.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160907305974e9---sigoranidepamizixabel.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d75f6e6f2a0---59449684845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=what+over+the+counter+meds+help+with+covid+symptomsPDF 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_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 17788 bytes
SHA-256: 23b0b6aa9b73f2c526bb4d3ffe517dcc4b8cb52fd6c9bfefd4e30c810e521982
font_01_sfnt_off00012f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F44 11136 bytes
SHA-256: 9e5caec0c64ef7e3a5c8d2936529e4ba32a40105bcba28e20fd418f6d4b7788e
font_02_sfnt_off00014929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1