Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df05159eff23325…

MALICIOUS

PDF

71.1 KB Created: 2021-08-16 15:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3cfdc428a22753451bc3c0d3a16acff8 SHA-1: c83d33575025dcd5620aa4202c729b6d4de0f1e3 SHA-256: 4df05159eff233257fc658b6a05b6ff4814d90a993445189ca1bc585367aca45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish for information. No scripts were extracted, but the presence of multiple suspicious URLs and the high detection scores indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=carrom+king+mod+apk+rexdl PDF link annotation
    • http://donaldbermanmaimonidesgolf2020.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/56481802898.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/nabexaradepatukazavo.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/muzamimiranoduzagotapo.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/10196076195.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/40173668896.pdfIn PDF document text
    • https://pasarant0g3l-turbo-h1t.com/contents//files/40626696861.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/11806122303.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/36890136165.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fbfd14cc35fc8148798ca48d5d4663e5/26285498602.pdfIn PDF document text
    • http://vuason.vn/upload/files/38133818555.pdfIn PDF document text
    • http://gabortech.com/admin/file/38493178973.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/foguzusuxawoxoke.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/49859019873.pdfIn PDF document text
    • https://huanghecables.com/d/files/57855496491.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/jobonekiredidoda.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/78954602041.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5rgkd0qghi58u409eik1ru6292/46031473038.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/37266521533.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c22221eb9---24937230806.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/1480991478.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7952b1ea02---60707352856.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/446b291216f05c76d85300b507aadd08/87506356050.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b447e30e2d0---kujezeva.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_off0000b5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FE 10696 bytes
SHA-256: 27c3727932acdea19938802d0af012086a23cafaaf774b6e0269e5a6a2eb60fe
font_01_sfnt_off0000ce3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3D 15044 bytes
SHA-256: 315a1254546f38fee6832de5c72f6dc628848c9b4ad1ba592166a719dac62956
font_02_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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