Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd4605235bc3642…

MALICIOUS

PDF

86.8 KB Created: 2021-08-14 02:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7dae4889bbaa533f317e7a53a5ab848b SHA-1: 9eb0e0429b983e341b39494acef88d8b39b944cc SHA-256: 3dd4605235bc3642774f782a725a5bfd4fa01d7dd963212bac21fafa5da1adf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=gothic+3+mapa+interaktywna
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/7fdf0e78c3b1d4d1d2af34ea8a47b717/lavuzosedififebujagi.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/jajunefaxedijeropalo.pdf
    • http://pajurioverslas.lt/ckfinder/userfiles/files/6106119074.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5612f4e7eeb567c360a090c971816bba/xifexulujaxobepiwejonuxos.pdf
    • http://files.ibiza-ferien.de/file/67162365726.pdf
    • http://daoltrading.com/userData/board/file/votubanevonofopinose.pdf
    • http://accessprecision.com/userfiles/file/23052631376.pdf
    • http://vimbark.sk/editor_uploads/files/dikanokuwedidimazufufeke.pdf
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/guzezufike.pdf
    • https://classconnbio.com/img-jacson/files/nagobosugin.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763d7feafa5---tinilutiripodi.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/0f8fb3b794abbe4d3f46fbc725a43dac/bodenofasopizov.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/efb14394874090c952c0fa016f34f519/59201507688.pdf
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/rapukuxi.pdf
    • http://camptagola.com/clients/66689/File/siminepoletoguwegumi.pdf
    • http://szao-spb.ru/images/news/file/22088215325.pdf
    • https://samarpanbharat.org/trila/userfiles/file/7372140085.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/78aa937ccbc80c98d7f167ca29f433db/dosisalunevametulevoroli.pdf
    • https://vinniescustoms.com/userfiles/files/6240749715.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1e211064fad819e862b0673c11de0fe4/kunepuniru.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910c5702b68---lamulidu.pdf
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/87130668553.pdf
    • http://commune-bourre.com/userfiles/file/10267103350.pdf
    • http://cortabellanews.com/userimages/zaribevilupofulafomenamav.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_off0000edcc.bin
c211a6aa148e921a150a71fd2742f20094c076319847fc24c8424231bd06e526
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 17676 bytes
font_01_sfnt_off00011a86.bin
eb423e33dbfa4401a45ceae362f7fccb61cd52bd3b7ee0cac37bda7a6ba2d895
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A86 10928 bytes
font_02_sfnt_off000133ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CE 16792 bytes