Malicious PDF — malware analysis report

Static analysis result for SHA-256 859a40cd6a2cf007…

MALICIOUS

PDF

90.2 KB Created: 2021-09-17 06:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: beb7a251ca421abf657efb7102036d9e SHA-1: 1a6a88874e89da03c427383cb87703021b732c0e SHA-256: 859a40cd6a2cf007ce4f8d382ed9fc1adcef62c193ec061fe483fc9d1471e621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded links align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kadh.kr/bobod/upload/file/livuxariwaruvopuvegedivu.pdf In PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc09ea341---badesarozebukojob.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/sopadane.pdfIn PDF document text
    • http://superazs.ru/images/news/file/zuvowizitiremowesi.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/rosanezewolasan.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16143f17c2c055---44843078300.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///zelololasidalobajere.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/tomipifidusipotutafe.pdfIn PDF document text
    • http://koala-al.com/d/files/panipemutujodaxasuneje.pdfIn PDF document text
    • http://lg-palette.com/upload/files/61138291318.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/8023145764.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/28977342824.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/2655457734.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///46440335584.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/riwekosom.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/18210279173.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614045dc22c38---ninokinejifom.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/58221409178.pdfIn PDF document text
    • http://hydrem.ru/images/file/jareveromovevow.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/84091181004.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/39150163004.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/20658039809.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7eacb6cb3693759bce7de4f51836110b/8943188175.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/nukis.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/widewolikusajaviwemivuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=love+movie+2015+watch+online+with+english+subtitles+download+freePDF 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_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 19792 bytes
SHA-256: 611d51fe75fe0deda02160dd488e32466148d7786b1c1fb13e7903913577353e
font_01_sfnt_off000126b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B2 11700 bytes
SHA-256: d61ba8e15c8d717a133200beb6f0e1c7bc2d9fcf48ea2092effaf6176f809182
font_02_sfnt_off00014260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1