Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35b157edb981a3a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 00:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7618693e3e76a7501e68cf6ac5730edb SHA-1: 7381b198cf15b5c9a4e8eb058fc5b67d41d837fa SHA-256: e35b157edb981a3acca060d6648ad9cbd96a96c32cdd8fff2d724be7cca0db20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous embedded URLs points to a watering hole or phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25f3d03671---18382198159.pdf In PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/48717203805.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/nijivebigiwirefunokit.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/47297645700.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/rowufubotutobenis.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210730_59362E15890763D4.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/v2o04699oqj0knc4rocks4graq/fufoladu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611962c24227f---80655155361.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a8341d1a968---96796806035.pdfIn PDF document text
    • http://coumert.com/images/file/28107505744.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/wuxobigavibajetixa.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/a585ca7cb21a29202c2fd8b0f01c7903/32040640791.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/velinubikejawagi.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fed0df78d67f9060c5190793be9d0ce8/9254533020.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f74f2cb0---19956764504.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/deguxedupiwebinar.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/192f5c5cd7ab225ad4a5abad330ed974/lemagomoketujer.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/58382424504.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/68291001078b7c2a83105dd10d85524c/xigeminem.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/rixajoteruvus.pdfIn PDF document text
    • http://slsnn.ru/content/file/nogowapas.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1183a0db3e9e4923b095ed8669129aa7/xowexexojefax.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27aa7e52b9---10806319822.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/16822753258.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=military+pay+chart+2010+pdfPDF 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_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 17076 bytes
SHA-256: 466f4c700f027f10ba6db1aba24e1e1c61161e3b6dcf5d697766fe1ba6fe07c5
font_01_sfnt_off000104a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A9 10592 bytes
SHA-256: 3a1122306e764879a4f0411f800293820d12dc714e4a0006833af1dc3f210ca0
font_02_sfnt_off00011d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1