Malicious PDF — malware analysis report

Static analysis result for SHA-256 e98876cbd40abfb7…

MALICIOUS

PDF

87.4 KB Created: 2021-07-28 13:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ab3a21a5adc5666f274e0481543a3fdb SHA-1: e5d2f7c11245798011a36aa9adcc6432a21ede20 SHA-256: e98876cbd40abfb76109b12a94c82b328f015cf8f042d003fd9ccbedb4696baa
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution intent. The file's purpose is to lure users to these external sites, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4599

Heuristics 5

  • 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
  • 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://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/672b1dda0207f2e54d67f2085c9b742a/wogikefedebu.pdf In PDF document text
    • https://techson-cctv.com/upload/file/21742326765.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/44bcf49abf4a96c899c2f1e2b48c0f1c/94101772227.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/64134301283.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5948dc555---wevixujapelikakopew.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e115ba83b60---29577852855.pdfIn PDF document text
    • http://abpaluso.com/upload/file/jimorifabita.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d4f12dcf2355950a31ebc4edfb79dce9/zifadigolagese.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/jumajife.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/60425020393.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b04b3fb42---88882882450.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/vikarobedudesozinip.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/13279467477.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1843247981---37962342544.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/27bdf1228fc91ff430499aad88b26fab/jalej.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/gejuwigevuk.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac3fd5aad8---zisitufunemoli.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/komigikenoboxivivuzisaxa.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bogofulejixepikuzat.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/xatona.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/e74fc711b8736196b4c24b0f079774fd/selumipoveranagotamap.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/da3305951f262d4bf8c450b274799ffc/wujozonapuzuxedela.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/78324415535.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/hii92581tm4h4eu385vhg4p806/rapuziwavuguwex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=free+sewing+patterns+womens+trousersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 17516 bytes
SHA-256: 49d4e58aa8960827d3e62ba161b769b8b856332998b316e1fbaaf55b35ec7e72
font_01_sfnt_off000145a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A6 10712 bytes
SHA-256: 18f4dc5f84905e0d58c1ff44123295307592a3ee3f670c8c596556b37d8a2fc3