Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcf89ba20f22d97…

MALICIOUS

PDF

89.5 KB Created: 2021-08-10 17:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0469c5b53b227500e550e6975399f73f SHA-1: c3a8bb3e21ff1a0414202c9db3edaa447f52f666 SHA-256: efcf89ba20f22d970bfd541ae0f59a1b637b929a153894d607273a404a0f46e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://ketchas.ru/uplcv?utm_term=examples+of+organism+that+go+through+cellular+respiration PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/avd6m3q402k2cn3v4dsk9q6ioo/xutanixorixevijudurilenur.pdfIn PDF document text
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/10008351970.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3450d6e90---58161638813.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/133efd851714ea688a38fcb34be6022d/segifebexenawu.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/11877895061.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82e303416---36823300647.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/18956974895.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/dinepuwizalijom.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/17198759792.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160714ca576821---visifodowapotuli.pdfIn PDF document text
    • http://royalgroup.at/tmp/3309743244.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5e48c5ea---84931781459.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/21247048579.pdfIn PDF document text
    • http://geoman.cz/data/file/juxigulodojiliduf.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/xapexonolegajudefonegivu.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a953ccc3659---35397264766.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/nipefepok.pdfIn PDF document text
    • http://www.eventoptik.de/upload/files/81182520837.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d28c5b41087---27521011659.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ec3916190---rujizavitewugalaf.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/92477191615.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4ca32912abd5f21ee855ff0bfb96afc1/75821594285.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/92927176352.pdfIn PDF document text
    • http://takeacode.com/user/d41d8cd98f00b204e9800998ecf8427e/file/98371793567.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ifjk637lbvemtkb007qufr2fm2/bavofekenuvulikofirikul.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_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFB 11112 bytes
SHA-256: 2b73b5ed5f58c51fdedd2c8d7020d2c6733b06f675dbbed169b82dc6818dc314
font_02_sfnt_off000128bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BD 17404 bytes
SHA-256: a9c333e9dc90e6cd22440dcb4ad2d4dffaf14557a3b34415cb0c536ef417b160

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