Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4215c1fd218e4b4…

MALICIOUS

PDF

119.2 KB Created: 2021-08-08 11:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c71f1b54e98369e7007325da1f38a38f SHA-1: 076556b0706ff519eee74dc48514e18c1ebcea05 SHA-256: f4215c1fd218e4b48f90fa40ce3631df48c0010c4d136c6bd99c844ba7e793d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics and embedded URLs points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://terminal.hr/userfiles/file/numadu.pdf In PDF document text
    • https://cafepiolho.com/uploads/assets/vuneruvupibonax.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bumupawazirisal.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb7f848a36---74363610166.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/17143285494.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/kelonutibebobi.pdfIn PDF document text
    • http://patroha.hu/file/11348771680.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/28220992361.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea394a3a0---95743919473.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b9fa22b9b---22706903279.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/37095467556.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/26453833950.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d3c63ff48---41670708346.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160967fa960038---gewumanekepupiwe.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160706925a1936---34466702924.pdfIn PDF document text
    • http://amandamaitland.com/images/file/46378316145.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/siraginasoxo.pdfIn PDF document text
    • http://519pf.com/userfiles/files/vozexajugu.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/rogalotoja.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/vagitapaxawitafirubu.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/nenamuxanesuganit.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/6479799577.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/41041dbb229f3ca5134c6da54c5cf49b/5148911196.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efdd853b0e4---xuxerusutiwawezapaf.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/borotuxidebebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=steven+universe+season+5+google+docsPDF 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_off000164a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CBA 10920 bytes
SHA-256: 690528e4c1aa93b2763702a9b636791577fa4361b7e71eed9553f7fef25148a3
font_02_sfnt_off000195fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195FA 21744 bytes
SHA-256: 1fe7158b72a04c2d7269903badaa39794394e8496f650406cac8fe39191453e1