Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5b099d0c4c184e…

MALICIOUS

PDF

69.3 KB Created: 2021-06-11 09:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e005931bea0c31d2a0b0d224358a084b SHA-1: 5dd53d2a048321bcdcfbd1275b3962a07b1a8b6d SHA-256: 4c5b099d0c4c184e0a5f9b4587f923207c97f1d078ca92770146eaf53caa4827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The document body, though heavily corrupted, contains references to 'grade 6 time worksheets', indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=grade+6+time+worksheets
    • http://fotocaroli.it/userfiles/files/25654180363.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7ba36c6df---9217140868.pdf
    • http://novichiha.ru/pic/file/pijisodixodigoginu.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/buxugedokiliwipebuxoz.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d27a66a6fc---58701422130.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/huo9t5np6chdmomg8tcvt02t9c/56533721092.pdf
    • http://waukeganeast1980.com/clients/877304/File/47149183538.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160aa1af1c5674---92021535899.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb8168f582---mixelejizixokulifo.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967263eb5bc---muwifoxe.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/727eaa7fa9697443a6e35153e05fbf2c/wezivuperobanobab.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/ea8033ffbcae16c2e91afaff9d8ae712/55543170450.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b02881dd---18507417362.pdf
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/jafaxeliwopenu.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078168e0403d---64947585681.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d851.bin
61d5032bcbfebdbc093d04cf8a01990473317fb4f59560fe5d5b4c6c6cf0e0a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD851 5372 bytes
font_01_sfnt_off0000ea84.bin
75da061ed2014be1f62a59ffacc8dc1b22aa6938d65808bb65d3e6529f4b28e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 10788 bytes

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