Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe0d94b3da6189b5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 21:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6771cda8300a3d8af104c9b530196fb6 SHA-1: e5d70db6ad22b3d50d85d60c65cbc8dd5c92d39d SHA-256: fe0d94b3da6189b5842be8c66fc3f3cdd31fdd103f8102a167d65d9e4bcf2e99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and link farms, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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=fidelity+2020+full+movie+online PDF link annotation
    • https://csn-alliance.com/data/files/84907051206.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/34704203930.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/31855610249.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/nipatadifebukuku.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/54446198997.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/87119896722.pdfIn PDF document text
    • http://melvin.cz/data/57382117073.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/c134d907291b447ab12ebcded01f0dc2/zemazuzivalalo.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/vogetinubanuzonig.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161387ade21555---xeromobaka.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/wonikof.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/58574569909.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/pezuzebe.pdfIn PDF document text
    • http://remobudostol.pl/pliki/7822045561.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/1762399787.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/visabasagadomi.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/xijifovojutipobaf.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed58e3602---setuzevudirine.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/23587746973.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/kamof.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/747313210613eb13eed88a.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/rutanidufaderumuxavemax.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b07f9a3b6941796065ac5b3c485364d9/julikunexobowisiwulivof.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd47176508---67163158510.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/76267265832.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/tireroditutakir.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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 17828 bytes
SHA-256: c1a2c7bb596d2371ca3d0734112e024aedf84fbd0f64bc655b42ad4214c39b78
font_01_sfnt_off000111b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B5 10584 bytes
SHA-256: fdf05108fa11b81b789efb6eca770fcae41e6edf98fcaf26119c5721edd85427
font_02_sfnt_off000129e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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