Malicious PDF — malware analysis report

Static analysis result for SHA-256 0381e1130fb6c8da…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 16:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2717d91be6cea9096cf77da7aa4abdf SHA-1: d37055d714337e8878998fbf99e065be5039fba2 SHA-256: 0381e1130fb6c8dad41bc9dd3d66933bcf05bd1331cb1e5dd65542bf52e3d200
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=sample+professional+resume+pdf PDF link annotation
    • http://codemessaging.net/ckfinder/userfiles/files/58304076254.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080648ab2b64---77981317652.pdfIn PDF document text
    • http://kme-kme.cz/files/file/78868846640.pdfIn PDF document text
    • https://tessuno.com/upload/files/6118c2901ee15.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/sekamo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d05b39c11---gugivis.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/xizujapumimamodulowezejud.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/3043bec855084069889eb20467ce5cd0/lopides.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/49880052088.pdfIn PDF document text
    • https://people11people.com/uploads/File/zoxumojezunege.pdfIn PDF document text
    • https://marijina-romarska-pot.si/userfiles/file/48124823733.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/73848115908.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/6aose6u95504nr72ta9tf240nd/20793046789.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210630224143_twa60w.pdfIn PDF document text
    • http://apothepharma.com/upload/files/napozexofirutes.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/edd79814378f3db948f6b21373439312/79929220064.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/mexuzazix.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/wufidedipagoguruvit.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f9f5afc4b---bigagitukidosodolinawud.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/85431586988.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090946fdc8ac---vumetenidupunafu.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/sanujetiberum.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0b74c750---88580229105.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f0c4cb01f---rudomagepulozomafavewexe.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_off0000e2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C6 16756 bytes
SHA-256: 5a5cbde74a56b5673286059a3b9bebd02aabc6af34a6917036993917e4c00543
font_01_sfnt_off00010e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E43 10736 bytes
SHA-256: 24e6de42e5517b4e548c804287e3c1cb1b8af2cab27eafaa47f57c3985788efa
font_02_sfnt_off000126ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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