Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff7a6bb42c470ec…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 15:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2597d8fe0d53a1554b0faa183606cab SHA-1: 6883e0a7bd4bd6e378ea7fc6d68c3761cb8788f1 SHA-256: 7ff7a6bb42c470ecd3cf162e68a4bdb68236a81846e9164c2c5fc522173cf6d6
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure aspect.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cloudinfo01.smartevolve.com/images/ckeditor/files/32219183696.pdf In PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146a7080fd50---5030778143.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/43084622593.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/zarukexigejutaruramawodo.pdfIn PDF document text
    • https://ganport.pl/userfiles/file/17710392484.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/849445d798a3de689a5967a0d2cd1c5e/85801365054.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/97670703325.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/bb82e5309504539b9233854152f2faa3/45536224506.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109110627244186.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/40625528688.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/62951013752.pdfIn PDF document text
    • http://net-work.cz/data/file/89542312826.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210912091444.pdfIn PDF document text
    • https://rajaunited.com/contents/files/mufirosakemaxir.pdfIn PDF document text
    • http://arablift.net/userfiles/file/gaxotatuvudezekumiralev.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/gejativurasexusikuvuwi.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/segisosetowulitomizu.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/fitifamobil.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/89716395367.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/72112162793.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/vabimaja.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/77786298611.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/roluk.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16143824e8511c---57212075492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=frp+bypass+apk+megaPDF 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_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 10456 bytes
SHA-256: 662d57435d35deca44725a5bed0af1f8c1bacb634a5490ff70d20f7f1defebbd
font_01_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 18068 bytes
SHA-256: 9991575b89b6aa60ac9e744fc8fc144513b5451d61fb7f3e6467e897f1c2d9ec
font_02_sfnt_off00012fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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