Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce49da9efbab9721…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 19:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6830fbd6771232d055f17742f5ca4187 SHA-1: 59c54b229ab02a23e9ac1b91e1999cee5ca2390e SHA-256: ce49da9efbab9721c7fae584972c79fb929bbe68f98b74db8fec32d8e54ebc3f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is classified as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains numerous external URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to host or redirect to malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or plugin, a common social engineering tactic to trick users into downloading malware or revealing credentials. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest the document is intended to exploit user trust to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://ketchas.ru/uplcv?utm_term=save+pdf+plugin+firefox PDF link annotation
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/853203a96f251a9f96ba53e16dcca3cf/97396713373.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/fovizil.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094605494f84---rikizurodagow.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/30740312398.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/bepubetote.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/96980227988ca7d2f9b713de9ba1d9d6/94073329964.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/linoxosunigazap.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/38004915137.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a677c7dfc54---81273052983.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/nenul.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3320572dc---wenuxedodegusibifuk.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094c6b67bf94---noroxofi.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7fec89b24efc1b6a51d2d574edf826fb/lipewiripalib.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/susoxatabatetesug.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/valujif.pdfIn PDF document text
    • https://xn--dokumaanahtarlk-llc.net/userfiles/file/20804185134.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/88f77885f2e1bb16b0c4ade9b6e6f986/16075207769.pdfIn PDF document text
    • https://faceless.me/userfiles/files/36290520846.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/814n3r2i3vckqt0e8s7u9cl6v2/sakovatovibogez.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/22616365419.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/7af28660a4fdaac7fe72038f533c2f87/nunilatixinupamasotas.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161344648aec46---penepuwuv.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/papefaginokibijufakoxirux.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/fuzetuwiruriwu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4fa9074115a44eccd02127d98b8dbf18/lafajipifekowite.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_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 17564 bytes
SHA-256: f65d6a23b58c6abde97d2f0e0960b6455d6e9e85f572e52cd4fb036835f36e64
font_02_sfnt_off00012445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12445 10748 bytes
SHA-256: 632982481d34118750d638ec4fe4a9c23e4789810b85c98d435351d503b47983

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