Malicious PDF — malware analysis report

Static analysis result for SHA-256 2950c53fbedb8427…

MALICIOUS

PDF

79.4 KB Created: 2021-08-19 05:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f39f103764cff6830c5e1cef7bbb5f27 SHA-1: 5e22e3fa6bfb2e1306da7743314bb495d6d70f88 SHA-256: 2950c53fbedb84274d6aa2ff57f34015678e705a6ff806dd00ed0b0d967cf0ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also contains numerous links to compromised websites, including those hosted on WordPress upload storage and disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=possessive+noun+worksheet+grade+6 PDF link annotation
    • https://anitacalderon.com/ckfinder/userfiles/files/fenuwewogorax.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e227e12f---14387014654.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e96b4444---39888042888.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/3e4e97f6f37bca587039be5388bc9f97/87241111062.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/vabowibelexunapusa.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/wexafomedokasibe.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8e8671273---surejibulivulomodi.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/wavavenusitekebo.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/3a68628d7b592a444137e8fd08d951bc/71970077353.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/vetejonafogimiku.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088318fd2f2f---zegisopowimikiru.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1610b00dc30d6c---bafixexaxigerojom.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/f1l7gl2jmji503dp9a2ibgbb03/68820229481.pdfIn PDF document text
    • http://tw-go.org/files/29689753.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a610f2d56ef---jamaxipigalalajozikovisux.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c520528569445347a253225f990b9ec/73910157499.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/simukekufutere.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/65450089015.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/nedupulifigewunuvu.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/mutexuwego.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/b7c466t4849daagbd71ltrabon/36637366787.pdfIn PDF document text
    • https://brod-plovdiv.com/images/49695929806.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/60550185398.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/23201856485.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/pufevuxagirimepexugabowum.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/sovubi.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/72617381009.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da27a7e8dfc---telarixiva.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_off0000d194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AB 10992 bytes
SHA-256: d38033f1d4b707233751053f79c7d330a221568039dfa7f4d7286bb348cd666c
font_02_sfnt_off0001031a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 16544 bytes
SHA-256: 449dd37001b8eac82a38ea8143d75f7efc727036b0abf0cd7f6e0e2449752bf6

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