Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb8f799dcef1b51…

MALICIOUS

PDF

92.1 KB Created: 2021-09-23 17:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fe4cf7ae88358dddb64716d7806722fb SHA-1: d989cd5c7a4dd126d47bfb510be5c3e1fa9256ad SHA-256: bfb8f799dcef1b511bd5bc70acf7a12cfd13977fd53f74d098b7a8211569b4d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The primary lure appears to be related to downloading Minecraft, a common tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://infrive.ru/uplcv?utm_term=minecraft+bedrock+edition+latest+version+download+for+android PDF link annotation
    • http://cukiernia-waltar.pl/qcms/userfiles/file/75979517642.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/jisajelugagixobidan.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/xetovobumizavineruk.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/gewuku.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/43107755804.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/19325800207.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/papimafawovid.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6rlddhs8lcf18mgnpu3j0l87tq/61794354177.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nefugonabupabararefilile.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/3196168189.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/82322754834.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16131a1a859b34---jadevutolip.pdfIn PDF document text
    • http://marymo.ru/uploads/files/lilaxo.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/vogusurakesopajasaxiw.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/t3jupfhcfif0vsqi8an90n7d24/tesowus.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16131818a913d5---togotebafigitofonesisivo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613880ed3580d---vugojizenajabusinabazifu.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f953799b30---taniba.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/muputosowo.pdfIn PDF document text
    • http://lukinserv.hu/file/64126907341.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/dirijuvusekar.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/17083291313.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/53508905330.pdfIn PDF document text
    • http://jadeite.ru/images/file/17000954862.pdfIn PDF document text
    • http://i-tos.com/userData/board/file/21787833049.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/98999510773.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/66688261659.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_off000101d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D4 18008 bytes
SHA-256: db316abdd89fad1f248f294934522874cb28cb0afea6318dffadf4db25e31ec4
font_01_sfnt_off000130aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C1 10844 bytes
SHA-256: 3f5b096f6e53319053aa57dd0d98976f7df316ab286c4eb41afe65c8a4ac55b2

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