Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7dc53db9876c689…

MALICIOUS

PDF

92.7 KB Created: 2021-07-25 22:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35baae90c823659591f6d5bd7238f18b SHA-1: 7472a4e7857aca0133715abc662f8a4ea9279922 SHA-256: c7dc53db9876c689a1d53aa1152d0f174c79c80dc06723ccad18d7c523a2b809
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, a common tactic for distributing malicious payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive, which is then password-protected to evade initial security scans. While no scripts were directly extracted, the PDF structure and link farm suggest an attempt to deliver a second-stage payload, potentially via JavaScript execution within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://envigest.cz/upload/file/gumuxalofiraminewo.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/9chrm2f39l9io3snhn2e2uo4j9/65550266290.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/5agj7d0864fp8ecb0b27jp85n6/47567229024.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608480c76c5b2---dejikoxoxinobibano.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/6r8te7vn44pjk7e9igf5g8dgh1/3341918230.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/82756613852.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/nefekuzijaw.pdfIn PDF document text
    • https://facades-metal.ch/ckfinder/userfiles/files/17114482568.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/40010157435.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/304e68754d15332ec5d5b759377b0049/wulegijunolenakovuwol.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9ef01a2c4b815bab72614cefbfbd877/23154805084.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5cf229b2a4578ee719335145c4bc3a15/bajerijivekepux.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jakowixenabedefo.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca9f29ccb6---87837428452.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/05d0f53f92ec57db9fabc7319dd67503/27979824660.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/564f5b90e7b20c63aa673ddb5c8a6c48/jevotide.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/keseloletisar.pdfIn PDF document text
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/61944485677.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2697b1e91f---69409012530.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ec7c82be8---76938402963.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/26451770830.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/joxip.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2903961036b5bdc8c1d1d0b81007f306/zinufir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=windows+10+descargar+gratis+espa%C3%B1ol+megaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F2 18240 bytes
SHA-256: 70a1c3342ed81d2488a9f532de7e953aacfaed045403f085aecadebc453a5b16
font_01_sfnt_off000123f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C0B 11316 bytes
SHA-256: cd867c6f9f992cc3ad32c198f9fdbc58bade9bdb2541e78e4124183086301586
font_03_sfnt_off0001563c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563C 2924 bytes
SHA-256: 51448b4be48adccc45121def4bcbf535a619dffcdc44ba89f8bcf9aacb4b73bf

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