Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2557be00e4c52d…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 09:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ecde769691302722a60c4e063c6939f8 SHA-1: 333150fa5a71e87092a6ed97dec93994ca673f3f SHA-256: ba2557be00e4c52dd77f139621b785a37e4b587e13a6b3cc282ff92fc952404c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination of the user's click.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=squint+eye+treatment+at+home PDF link annotation
    • http://neteyes.eu/editor_up/68498582528.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504191526820.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-7-1/20210701024206211508.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/89756857861.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/ij0a65ea92lvifiq4it9g4joo2/50679766934.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/85868097243.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aea023c3e21---98624775428.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/kajojavetofumelobo.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071c31a55b57---19693056122.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/86754588101.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/nozet.pdfIn PDF document text
    • https://jagamimpi.com/contents//files/38229418747.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ddrs9jrhprl6560egfisosoc3o/17926765711.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/3953422809.pdfIn PDF document text
    • http://strap.sk/uploads/file/jisoteto.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/milurozil.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/51918315685.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af894a7cd17---pudututagerasobovokot.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/47677107952.pdfIn PDF document text
    • http://alkanboya.com/files/file///fofusikodos.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160818f402fc93---21421612587.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/gijukafigenuwi.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/bomipubafilovemivedipam.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/jelulapigi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6g8vdv7a8am3svb50rmdepv22/fodofabigojowusilimomeb.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_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 17488 bytes
SHA-256: 8403008269a43d53bb567402bf4ac52c85968a1aac9f1094d7816c423b6a72f3
font_01_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 10592 bytes
SHA-256: 9d1829124d4017bca1f37ba481133816b677d91d42540fde5615e08ce3978a39
font_02_sfnt_off000137a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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