Malicious PDF — malware analysis report

Static analysis result for SHA-256 95811d9458bc4978…

MALICIOUS

PDF

78.7 KB Created: 2021-08-16 06:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6bb0d3b5ce4e306f1bfe3f87161d3781 SHA-1: f28223b85ebc5ee5947fb826db8b1ab4f10f9656 SHA-256: 95811d9458bc49787f87a16d1fb72070f98aa3356547e19a321948cea9cae5a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of numerous external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=the+norton+field+guide+to+writing+with+readings+5th+edition+pdf
    • http://unipsyclinic.com/userfiles/file/20210728094518.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adab9d60f00---gasomekis.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0435a377e9---88953523001.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fea7985bac319aa7e4e46ad103891b40/rewojorojexababoxabope.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16108925be6d37---vakajitavafoxokikumoferi.pdf
    • http://longarmacademy.net/fckeditor/userfiles/file/gidojipebanitu.pdf
    • http://lucavolpicella.it/userfiles/files/25514918699.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f13364d3c---66042244325.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/941ggorj0q656eep1bph8fhfd3/16502275482.pdf
    • http://omonetach.pl/foto/ilustracje/file/mudixivuwujekipapivuwoxi.pdf
    • http://ace-pharm.com/upload/files/94556562069.pdf
    • https://steklo-shik.ru/userfiles/file/22942324134.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc98a18b6a---34311231334.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/81586140177.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/ruvajixexofamakodogev.pdf
    • http://rzn-house.ru/upload/file/tavejibadid.pdf
    • https://audreyheselmans.com/_files/file/39613960110.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160821d2d47761---duwigofeliz.pdf
    • http://dblbtech.com/userfiles/file/kexepav.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/16832572688cb7cfc0910b000e74f763/zukebipezawoluve.pdf
    • http://purofirstli.com/userfiles/files/sodagova.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce1a.bin
6363c47af43b9a294ac6d93669f8ebf32f46fe319b2eaaaefff1ea0ffe21f938
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1A 16736 bytes
font_01_sfnt_off0000f9b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B5 16792 bytes
font_02_sfnt_off000111cc.bin
27a365b004d0b95f0d31ede6d3ceb3c38d4b39eef49aba5324389576001e386c
pdf-font-stream PDF embedded font (sfnt) at offset 0x111CC 11060 bytes