Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff95c95f803c4e7e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-06 11:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: abac4a5c12274b4764d83a5d9e32f2e0 SHA-1: dabec98ce57bed00abf88ecca0c6882955b67bbf SHA-256: ff95c95f803c4e7e8c7921043c67981da6b00390618aa6520db4dc38ea86bfab
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and link farm heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://nomylo.ru/uplcv?utm_term=descargar+una+vida+sin+limites+pdf+completo PDF link annotation
    • https://vigiweb.cl/dinamicos/files/file/nitixosusab.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/17122368263.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/vivafa.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/dirazokupojugule.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b794fd1e5e7---pebirok.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/13745946235.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/8785451992.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/siwuvigibe.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/82hv7utmdjsegoorjh7bns2puf/kawenejunazomija.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/79066303850.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/nebopadusabezusemidakej.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/kojesutilusoxugopekuwot.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/19912391510.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/36396345085.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e09dc4b3e055987cc736c3e03fecdecc/14273474014.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/q5rq0l3a2n379piar8s9iuvsld/38031926071.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160fee1f9612a6---81073314401.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/d5e310f72d28acb905f1affbf0e6dee1/xewivupuposefiwifixavu.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/belitokujim.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5e51dd7d74a4e1fec0f98b6b19138e01/jojugut.pdfIn PDF document text
    • http://elskenecologie.nl/files/58906267252.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d267603391abb3bbf5e548cace5ce2d1/fumixidukanadetu.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/t9effujt11oeeqqgatghe5gcn1/debudebemela.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_off0000c8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C4 11132 bytes
SHA-256: a0664f2490b92f28dfeb69b5d0644046b4246de925f560562a8ab66e8de5217a
font_01_sfnt_off0000e29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000faac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAC 18896 bytes
SHA-256: 6705ab77b570a0a174db8b330d0f6f97a44a3585a247065ffe16fac523e6c0cb

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