Malicious PDF — malware analysis report

Static analysis result for SHA-256 378562e8468beaad…

MALICIOUS

PDF

86.4 KB Created: 2021-07-20 13:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 989b784906f6599035c1dd22a0ea8f5e SHA-1: 949657693f01d8645411bb3172974476309abeae SHA-256: 378562e8468beaada63bbabff12fd89bca326d5cd79cfc6029a18c830855506e
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4c43ce462---lifobonifeduwe.pdf In PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/fizidijepejubipuwowenise.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/melijuvazol.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075862b40fca---44970968952.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bebd7e571e5---70615548622.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a924873c16b---nurulevufufif.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/d50d4d5fcce292bae112c907c5fdb733/punasok.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/0e40f6fc6999007c9e867b9038a8f2fc/72133538623.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/pitejugelujagerojizeto.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b449fc6cfe1---dadodoxovalel.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8430c57950---xamelujikotamepozufiso.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/sebunonakonitup.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/67570706838.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/resazutenirob.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f07b9862---9480237525.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/4qgqrv2h8g3iemai94fri0839i/fibimerutobamijevux.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/14/file/20210514_121440_180.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9227ad8363598c41a212a61961b7aaf6/pedumugezoxilumafarinifa.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6df535594---koruwimikeliz.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/kibosajori.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072a4ec0cbbe---24164502743.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c07e8314f---81961346838.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609923c5b5c54---wururojesafuripovabil.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607860d81012c---47389941771.pdfIn PDF document text
    • http://amandamaitland.com/images/file/lijerosepipoxor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dos+equis+guy+sayingsPDF 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_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 17476 bytes
SHA-256: a0a1ecb81b8ec4452e6be256161e9a505b1756b16c65b0d0a16f00b54c23b726
font_01_sfnt_off00011cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13507 10400 bytes
SHA-256: bb1bd9bc355ddd7e6e632c88bfdd0d29dd360b82a58a1090fd8d00e3d1ae5c68

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