Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94d54672bfa2d4a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 00:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 212baf321ede88ad044a8eacc409f3dc SHA-1: 892616ea1712ac4fd75bfb1f18174eda1bfec635 SHA-256: c94d54672bfa2d4acbb0b86d85425d87b2ebb18cf1ea3fa7317eb961981288c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple unknown or potentially compromised websites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests the document's purpose is to host a collection of links leading to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://lyzph.com/userfiles/file/Fl202109080057248561.pdf In PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/sudedexedomix.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/rageba.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/59839581323.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/84579287644.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/d55te1fgokrid3llgi1rhiosb5/12729718078.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/42749929652.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/garilupowotudejatu.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/77677522431.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/13652099474.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/37965648875.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/74889856127.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/351965317.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///gafulufajatupunikolepafok.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/9e30f5980a2711205ceb1f4a2deef388/basirudofarid.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/16500431292.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/41834756395.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/79410947933.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac23046246---88146475097.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/wefizak.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/35226100993.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/koxolukuzixozipu.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/40348159830.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/gagosa.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/lumevetarewefiwepudatixu.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613add25a0e20---jipatavobudunufekowufexuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=equalizer+fx+pro+apk+downloadPDF link annotation
    • 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_off0000caf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 10792 bytes
SHA-256: 84e086b4b015c55af4e10d77726f41131c2d2a01a62096b23796ac6fd002adac
font_02_sfnt_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 17196 bytes
SHA-256: d6a42da670430ff7e0d778ef41f402a991f3e33f8c4cb04278c2596065309878

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