Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9e6a2ed424e08e…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 12:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5299f8c7740186a14ae95ca2bf714180 SHA-1: 836f1494994165824d9a5bd3314eb86131f87134 SHA-256: 9b9e6a2ed424e08ea055365b2a01557c2204b0ca3a53993e4121aeb1dfc8cd98
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, forming a link farm. These links likely serve to obscure the ultimate destination and evade detection, redirecting users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=personalize+text+message+sound+android PDF link annotation
    • http://pattarasawat.com/ckfinder/userfiles/files/89006534399.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/baxilazaxufojof.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/88188928268.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210911212506934.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/vajijogile.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/2227515056.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/boveralavazosi.pdfIn PDF document text
    • http://bndweb.nl/upload/files/63765197023.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/vesomegugomokuzive.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/gotabawabigosixokagoxid.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/96308398775.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/zeposojik.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146481438d3b---japagapulaguxidipa.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/gosulusawe.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/66384775162.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/34923296568.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149af6839e---xidibujitogopufeg.pdfIn PDF document text
    • http://plise.org/userfiles/file/segokoturog.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/59042039657.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/zutulebojemuz.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/pirikajijavobe.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/39369405328.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/40ff61f8c9ae937273dae1a42a0488fc/mogajuresukodopevifajoje.pdfIn PDF document text
    • http://kcwoman.medsoft.kr/pds/userfiles/files/55811548691.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161321ea95d64f---samawu.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_off0000b009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB009 10856 bytes
SHA-256: c31cf3b07ca3fdb05e250b7a4b813d3a12b33652e85a75e273581db98d89c823
font_01_sfnt_off0000c8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EE 15164 bytes
SHA-256: 517d6b48bfdc3357a5d7a475fbdd4c018761165f249d502616f38f90c76e5ad6
font_02_sfnt_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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