Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb7c1b9a2b5da0e…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 14:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c9e96b3615ce6f66361a0a2cc735eb78 SHA-1: fb3c12ea6ea7df00a17895a9acb35b5067a104e1 SHA-256: ceb7c1b9a2b5da0e0ff24cec013bce57185b04a02560584f614d84342bcad7de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of common phishing lures.

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://coretry.ru/uplcv?utm_term=cara+root+via+terminal+emulator PDF link annotation
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/46a696cbbf91426389b2ee09b2d50b93/nodalaxevexakugimuku.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/bolijiwobewizi.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/zugatupok.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/pufajiwut.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/76105854019.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/rl7cjo7cfp1a4m9at46s37njlu/sibalamixebemusavere.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/86961487920.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/zejosukedabodomip.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/37166244271.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/xatubex.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/tupefupo.pdfIn PDF document text
    • http://sswjeans.com/files/livunegoki.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/17752523812.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/16211058629.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbed5a0516---gitolomuvogixag.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/kejugatifavat.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/pofelokisizawerosuziku.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/39291550492.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161420f63cf0ea---8362176743.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/74825994962.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/togixufelikatilafinuza.pdfIn PDF document text
    • https://music-group-store.com/upload/files/56027366795.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/66346974313.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/karikasexanowujopotexux.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/42290791084.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_off0000b47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47B 14900 bytes
SHA-256: 4b2437fd85f774371589745e9eb8ff77c6aebaaf20ec469be7bd89bb1068f4f1
font_01_sfnt_off0000da63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 10300 bytes
SHA-256: deed3e803c7c796683f4c7cc2e5ba267ccd156f44e5a9e747a1374c91ab79f63

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