Malicious PDF — malware analysis report

Static analysis result for SHA-256 f980e936825d3ecb…

MALICIOUS

PDF

88.7 KB Created: 2021-07-03 10:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e62e6e246177f0a4f179ba437ecc73a2 SHA-1: 39272ee94c1db1dceff0d21bb6e3c2e53c0d9fe5 SHA-256: f980e936825d3ecb60e6ead661b586eeec50503f28d77240c0bc00f983fb88a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDFs. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a1803b0d---jixetugomujoboborurodudu.pdf In PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/jupodajeviguvur.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/83d2f3e3f22fafcbec9a18a246952505/tafowezuwukifu.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/97886905333.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160d365b1f08d6---sefipusuvi.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/jilufakezunawe.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e26039cbf11a3fbac747c79e585c916e/jelinadevi.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/repajoxakar.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/dutuxoxuvijefaxagaduwab.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48514f79c---muxirokuwezaz.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/faforomale.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/90009629078.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/7da777ddf362e4c85d4bc2598a867986/tedoralovimaje.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/69459682377.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/98510986049.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/xedizumevutelos.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/vidijawudoba.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/93225821912.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/omfkp282rb1e0tclrc3tcodro7/mukubenupo.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/95214633058.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/9bfa3f1751ee2ccdc8fc2459a8fab988/betag.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6921079306f98366bea2b8428d653c64/femowulonesebawafu.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/27519068923.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c61bcb92a8---vipoto.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/93412320397.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=absorbs+carbon+dioxidePDF 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_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F35 17236 bytes
SHA-256: 0c795d37689d5b3dd285c2d02eac130b0ecca23a16207346fc56cf0f6200908d
font_02_sfnt_off00013c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C48 10444 bytes
SHA-256: e9dc3807926d24df113df5b34dc043944bf128f1eb5cf7c852625194cd59816f