Malicious PDF — malware analysis report

Static analysis result for SHA-256 4272c0f5944056b5…

MALICIOUS

PDF

77.6 KB Created: 2021-10-04 10:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5be202f8d7d171ca958b7a977cbe3ff8 SHA-1: e5f4d928cc2df98f9bc261f259ec889312172dd2 SHA-256: 4272c0f5944056b502f0e54ad5fdfde3f2bfdd678e83c8b54f53e3ec64b14b29
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 compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of 'utm_term' parameters suggests SEO manipulation to lure users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kme-kme.cz/files/file/rovapedunu.pdf In PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/84855900177.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/95523567637.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/fesajinewulazaju.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614822b052a2b---wudisiralutivosijadi.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/ninomiwe.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/piribizisoxuw.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021092406471262.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/74933083268.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130607198f8b---zadubavoriwukuvakinibax.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/zobonemuwuridizujof.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16150f0dd6c7f1---97062660179.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e177356d7b---44220487363.pdfIn PDF document text
    • http://119pump.net/d/files/43626421180.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/xulubusirobujalajivu.pdfIn PDF document text
    • http://caribemed.com/userfiles/file/42188600458.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/84757802379.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/tirezije.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/7378054046.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/72049200747.pdfIn PDF document text
    • https://dalba.net/other_files/File/15488549847.pdfIn PDF document text
    • http://wenxuezj.com/images/File/lokibipalazisinijawi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bus+driver+full+version+free+download+pcPDF 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_off0000c5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 19072 bytes
SHA-256: 532c9fc2e2debf5910f457fffd92c72132541c76416ce2c1641d3c0405796876
font_02_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 10820 bytes
SHA-256: 0aa7fd71b0c113eca0d7f9a3777248f33c03e9a20548af5e7a80659e306f1bfc