Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd295dab75d1a52…

MALICIOUS

PDF

81.4 KB Created: 2021-09-22 17:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 981e15b1e1d7f078d471f711a200ed4d SHA-1: 874236f0ef84a10b67dddffe0367ec46c3d0f37d SHA-256: ddd295dab75d1a521cf83f76a09fae0ab268bde606cd4447b7a1aa7fb8c50d81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vodnik48.ru/content/file/xurizopa.pdf In PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132269697ec1---disolo.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/40467182279.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/fivizujob.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/birubazukulofireruwase.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/sugavuwofolawetetur.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/kubakunojiwa.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/gewitosimar.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/88500132507.pdfIn PDF document text
    • http://artepcb.com/upload/files/5918869513.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/panunizojew.pdfIn PDF document text
    • http://strandedtattoo.com/file/97832989975.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/2bojvftl1ai4od4gig6vs7f8d1/66505170989.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/bubinezebuvu.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/1696173103.pdfIn PDF document text
    • http://samtekelektrik.com/files/45347590280.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/sisolijolemipodax.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67843632792.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210911012345.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/1175f27372a32f6f85f6d39f06acf614/devigabiwodidalu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613983da593a5---22609386072.pdfIn PDF document text
    • http://turnyras.lt/Files/file/51115983705.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/fowojasirisurenifogifowaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=new+testament+survey+merrill+c+tenney+pdf+free+downloadPDF 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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 11124 bytes
SHA-256: 4b064f36078ea417214299c0ca4a11450de9bdb132f820ef13b5f5d282e360c0
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 17936 bytes
SHA-256: bb7bbd95a8952dea24f5341aa0335f90282833ef416b20dac27c56d634e21b62
font_02_sfnt_off00011f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1