Malicious PDF — malware analysis report

Static analysis result for SHA-256 6740035eadbbbe67…

MALICIOUS

PDF

74.1 KB Created: 2021-09-06 02:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3012a401caff90d262961eafd6e1c460 SHA-1: c3ae538e3144e3d32d3d5be8d51b0a7279ead99f SHA-256: 6740035eadbbbe677ab64c5c5f498ae5fee46ebe5a4aa7be19943555b60a50c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust by masquerading as a useful document converter.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=convert+pdf+into+word+doc PDF link annotation
    • https://stalbeckers.nl/userfiles/image/file/tunijidajubu.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/jijejiwebokazaxin.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/peu2pv5o213mki88gs98tfqf7m/ruguxufotogutoru.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/timadubevirejaweze.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16077724680012---29545815065.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1783a547622fd72aa5d92e2d67efb560/63511359984.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/gadetazowefaxofejus.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/347b13c58b2834af91347c5aa5fa64dd/kifizuz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/be5trm4evmuoojoojtsl5ruopg/jakoma.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/31265503869.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/676adb885eebb3e5c3b49fa26a5826a8/vetexukewinokakutujixem.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/6252212960.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6319e061fd23dcb10d8f2d8ad3f7f730/wubowudugasogo.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105171748012387468ygbv6.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1e2624d85f728f7c9143643c04c765d0/10856089146.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-3/20210503135359281418.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/98b4077f00aef2e74f58fc979984c74e/razozab.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/ditadililamolebekizobuf.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/ed3e56f1d9177db9ca0387ce460b639b/faxivugapa.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/27843068271.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/a2bae4bc18dfd27216fc2391f4d1e022/xipufevumewuj.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6431d5ca320bfc388c6e5d869c676b63/jilodulojunako.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/sulemopijoleta.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/cb1132ca5a8798fad27de62c2e7cbd12/mojad.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/3435223215.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_off0000bc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3C 10420 bytes
SHA-256: a1f68e3f4e5a7c091fe79e7d4476c69f617aadc3ab38c4169e4f6e88a1c0f3ef
font_01_sfnt_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 18104 bytes
SHA-256: a791f135645787ba36d67aea14dbda90cffc119931f5f654480053a4053c24a8

Open this report in the interactive analyzer, or submit your own file for analysis.