Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be6120023dc1256…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 13:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77d776a7b689a72e954afed62240c8a6 SHA-1: c521bc6d5974a84263bc39768e6964b11ae0a215 SHA-256: 9be6120023dc1256003f2a05ab1108e65318344a0d5b9bb5616f469e9d7fe789
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=edge+of+tomorrow+game+mod+apk PDF link annotation
    • http://vitacanes.com/uploads/files/39359540891.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/viropenovekox.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/sipedaname.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/34852885500.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/votefazafa.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/50748669823.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/11101443530.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kobefor.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/bujakefezivusowividivivi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135242d82214---1012858202.pdfIn PDF document text
    • https://ms02bet.net/contents/files/rutugodatapaseranimuv.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/xagokiminijom.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136de9cb5295---47348220615.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0059e20c---bejupariwidari.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/gosatikada.pdfIn PDF document text
    • http://w-mill.jp/images/file/pepabagukodutuxemewirijin.pdfIn PDF document text
    • http://iltorg.ru/upload/file/zonarajagezusipur.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/d9ese9896bq6r6nqp4lv6c40mv/12742846835.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/kikopelu.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/52592222684.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/65368465958.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/63880712029.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/wepurizifip.pdfIn PDF document text
    • http://malifer.hu/upload/file/xopesivupimulududusixunuf.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_off0000c8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 21612 bytes
SHA-256: 267919c4abae00d1c34e4b500f86e51f89d91b542e8cb0ca4a8561c20664874b
font_01_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 10592 bytes
SHA-256: 50ad97bf0940a81899496bdf6d7a32aacfecb79a5c58b866563c29c33d4c52c6
font_02_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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