Malicious PDF — malware analysis report

Static analysis result for SHA-256 2523eaccf5a69afa…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 06:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f26e6f0fa2b3cb81fb4eee8a4fb64c30 SHA-1: 9271c9a8b1530fd759c1803e9ddb6a755dc303f3 SHA-256: 2523eaccf5a69afa8584fce7af51e9a955eb573e7bdd4f62c477c5146987404b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely to distribute phishing content or further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://matstravel.ru/userfiles/file/varitope.pdf In PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/803bd335c88d3d1016f7bff6d353515c/soxopig.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/47538594749.pdfIn PDF document text
    • http://dhs1970.com/clients/9/98/98bceae81adeaace0f0761aa7b0d12fa/File/tebitovuzudezarefusapiwe.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607a115eecad1---8406716189.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/sadub.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee2281da38---45058136596.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/82385774805.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/21317398429.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/44949184490.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a217c99d---94198202534.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/26a84149a81fba5dc8125972c8080f90/86076991832.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/melelutuxunovujatigipilox.pdfIn PDF document text
    • http://uco-kampen.com/media/files/wedomopujazules.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca2722891---70432352424.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/19310781331.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/939ff500c9f882a168869c34fb49c42d/70316717757.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/votuturalikovowalogaw.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/1017459721.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610ba54941532---dosakanazokopoxokug.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/74512885788.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/sute2jq34g8plpde6gaqhg9p7k/52204343707.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071b270c9635---87696938215.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///20749889845.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/guzubasuzimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=sri+kanakadhara+stotram+english+pdfPDF 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_off0000db58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB58 17680 bytes
SHA-256: 3e17bb885044444fcc5ffd6c7bcc478ef7e1c858c3739438b866620ede4d8b12
font_01_sfnt_off00010981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12198 11112 bytes
SHA-256: 366970cf788e44708602cd38033db10ed94bcce14b5a0abb0ebb0f8641c4c72d

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