Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f275f032f05da4…

MALICIOUS

PDF

67.8 KB Created: 2021-10-02 19:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f6f4ddde3417cf3376e7dca92fcc2a93 SHA-1: 4176daabea454d96070cb24bcb92de849303afa2 SHA-256: 59f275f032f05da48e94a5825d7b5782e7cd8dae42b2700df65225c910d7eb69
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The ML classifier strongly indicates malicious intent. The embedded JavaScript is likely used to redirect the user to these external sites, which could be used for phishing, malware distribution, or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://garglob.ru/uplcv?utm_term=how+to+cite+a+summary+of+an+article PDF link annotation
    • http://samocvet.org/foto/ck/files/masazegojivi.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/63506550330.pdfIn PDF document text
    • http://erodiertechnik-wenzel.de/userfiles/file/42734520064.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/77651131070.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/660691809.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/87874464543.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/78097396325.pdfIn PDF document text
    • http://land89.com/ckupload/files/panokiboluminudor.pdfIn PDF document text
    • https://rajaunited.com/contents/files/tutofolene.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/kefixizadudetip.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/4508587253.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/add312471fc038717711ab4a1ebaea7d/sisojefotoran.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/57203820091.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/poxowinajixezaka.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/xakobatavotogalisonom.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d612079a5a---80753131382.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/38310622692.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161300eb619a1f---womop.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/womivalujodivuli.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/dujumolas.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/53820873166.pdfIn PDF document text
    • 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_off0000ac3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3D 10788 bytes
SHA-256: 60d762593867ba31dfb2d1864d2f0552e61d4fb035d383658a06d519863473cd
font_01_sfnt_off0000c524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD36 14736 bytes
SHA-256: 3acc45381ef1c6745160b9a1357ff145c54794a432736260e410b2c53b683b66