Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b09eba4b4e7fdd8…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 11:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87974b2fc7ea03ab9eabfc6f6922d84b SHA-1: fdb36c9499152423debb4f83b49b7e12ec8c3864 SHA-256: 4b09eba4b4e7fdd888f669a8d587df80e01f4607f5117c6748846cbea7a4ddae
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing. The presence of a link farm on disposable hosting and compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/511607545b3278c3ed5dbe6e5afe4ec1/turifujenetokezuzafin.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160911a2773ca0---87173172391.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5807eb89c8---gejuginivozipop.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/db0ecb78893f12e7a7db741b949012de/97792925339.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/71002013910.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/71420492545.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/4470887086.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/28jbdo0k5e6ih670r1c7hcppv6/dipaxefewebisa.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/80884534805.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607281b53f1b8---pomuvobepexazusaroxegi.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/81d3a2fce9b51d29e15549ee024567fa/suxupuwisarusimeram.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/fuzeworakuburewasijuwijap.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093c8186acc7---72522116797.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/0a68ad827864a25da902e664b8f7fb14/47029765219.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/vppa3kh6gn1euvrko552lr40u3/4582148788.pdfIn PDF document text
    • http://djapm.com/userfiles/file/pimobilubuxebo.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/44016862799.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/63344839540.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d32c1ef3---10840883478.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/86160880388.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160986ca86461c---6919910924.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/13480156899.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/1175bf92cc45cef41f9a4c9e1b56833c/63724778253.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/86343970978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=howdy+pardner+meaningPDF 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_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 18032 bytes
SHA-256: 37802d00bf0be460e43f8155ab5fb48577499114703a789c02c5e1fdf4769359
font_02_sfnt_off00013696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13696 10612 bytes
SHA-256: f90d4464375310248c5b56ab61221e11ff13f1fed9e00347a27898bfcea1faed