Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bae2179c3ca0d2b…

MALICIOUS

PDF

71.9 KB Created: 2021-09-21 03:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc0f2c4d1f25414d13d6022be76a09d9 SHA-1: aa07ef1d3e353a388d84783753f701c1c1b0b363 SHA-256: 0bae2179c3ca0d2b1a669cb8c0b5bd04cb991705a9425671aac97e4a7ae4e25e
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm, a common technique for phishing or distributing further malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=which+is+the+best+android+or+iphone PDF link annotation
    • http://medical-1669.com/userfiles/files/tijixamilitadizujaziju.pdfIn PDF document text
    • https://koratspring.com/upload/file/83373248924.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef3976e878.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/71520468000.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/74734603746.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/49789932150.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/9udoqbr4ha014qlgquou2hqgt1llovut/gubelagumesuwu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/54453582954.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cafb57e891---29807294271.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210904_D3C42BE67A22BEC0.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/62675341520.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/56356945968.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/33162165871.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/gawalakikorejimemoxupowa.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/674ad74a5628110348eac41b53966745/sitokizadaji.pdfIn PDF document text
    • https://bdata.vn/upload/files/faxisexipejusadudir.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161421a2333969---tumoxixu.pdfIn PDF document text
    • https://dcicz.org/userfiles/file/78455511905.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/duxadenokaj.pdfIn PDF document text
    • http://polipack.ru/content/file/14304790205.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/52516026999.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_off0000b72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72D 16536 bytes
SHA-256: d441d68a75ead320482e011f0b2165e7e792554e6acb4b85825bbe8143ba6929
font_01_sfnt_off0000e163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE163 10700 bytes
SHA-256: 7df563e51ae7946a749d54969a24e5979fd8f4986c7af6fa059216744bce0b57
font_02_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1