Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00c637818cf2be6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-29 13:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 92f70f4f0182dbe5eda8858c62bc2c2d SHA-1: 278bc6f9b83bc26aa1a5e659ff0ef11f72dfa9cc SHA-256: d00c637818cf2be62d060578390c4b9d36466daaa58d99e8cd34d6e72117ac9f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains identified as disposable or potentially compromised, suggesting a link farm designed to distribute traffic or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://immobilieninvestors.net/userfiles/file/90994267261.pdf In PDF document text
    • http://ecohouse-lab.com/userfiles/file/kisowudifokun.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/66779305489.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f49a3f9a7---80415551786.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/61424492775.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/poradumowapiwapol.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/93057725324.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/34272701058.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/11666688559.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/mozajorizibadutipakajez.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/sisotomosuputejazenivemor.pdfIn PDF document text
    • http://hydrem.ru/images/file/jareveromovevow.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/mimafewaz.pdfIn PDF document text
    • http://gro-felix.si/uploads/nasurunir.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144d09222087---dizoxul.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/6c27846d5b8e981428f6c2cd07d7d11c/belinomisivojuz.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/tavuver.pdfIn PDF document text
    • https://denimder.org/resimler/files/biguvaxoloseru.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/29136615582.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/l02c9hcorv7taei60pj54r4gn2/17973931798.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/80291702635.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/movixoled.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161436d63da91d---70598257733.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/1567347599.pdfIn PDF document text
    • http://tiquital.com/documentos/file/xukaxisikiriz.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/xiwijowenizanipun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=pastebin+m3u+urlPDF 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_off0000b458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6A 18692 bytes
SHA-256: 6a498c0b38c3d31869403568b9260420e4bc5295eaa552de24619e33af573f8f
font_02_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 10560 bytes
SHA-256: 7f04ce235f78fd34914773a6928f6d2dbf3c97762eb8c453c7da3986c05c3b55

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