Malicious PDF — malware analysis report

Static analysis result for SHA-256 5000b1c14bd5de64…

MALICIOUS

PDF

83.7 KB Created: 2021-09-07 08:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5862ce9a790fbd0e05bcf910bff2d8b3 SHA-1: 9eb901b960a5a9dfec88e329d47ddfb45bdfd7ba SHA-256: 5000b1c14bd5de64527ebe7cd1a122da67b463b269e76103d3304c49f6475bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely to host further malicious content or phishing pages. The presence of numerous links on disposable or compromised hosting suggests a tactic to distribute malicious payloads or redirect victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://axwelindia.com/uploads/vafirenurudizibal.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/acd14fe89573a367f3c8f7eda8d7ec20/buzapenubuke.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/76819681341.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ppfr7lng26gmoifs3su2fenif3/kukufitezedibuxajosire.pdfIn PDF document text
    • http://qdjshg.com/files/file/befulasaregimizo.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/zogejunusifatuwurefujo.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a04475ba9c2fc46e53f0794ecea2748d/jomifidizomekedodamoke.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16107556d8dd0e---mizefibagujomew.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086593602df6---44456779872.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dutobapalovijotunebivuwam.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/33248455463.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/62889757760.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c332b844a8e---29642254435.pdfIn PDF document text
    • http://ingore.cn/upload/files/womepanunaxomutufef.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16085bbde95b88---biseduwonenapiroros.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf3dad6631---lemowur.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/31133220755.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ddbb01ba---85197608552.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/dnk2k1k89dps76vft3ad30tt2u/toxupozi.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/c7341412646d3ed7b8f5f0e745600cf7/91826441815.pdfIn PDF document text
    • http://parilka.by/var/upload/file/23996787314.pdfIn PDF document text
    • https://bamor.org/userfiles/file/tozipoxefuvow.pdfIn PDF document text
    • https://linardi.ru/files/file/66987102316.pdfIn PDF document text
    • http://bamila.vn/luutru/files/gufej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=past+simple+classroom+games+pdfPDF 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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 10860 bytes
SHA-256: a9aab9ea311d53087894d7efdf17989b7432f19cf42aecec80f8da99b19614aa
font_01_sfnt_off0000f910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF910 18080 bytes
SHA-256: b275bbc44482e1a837d118901b902dd6f1d7ec674982dfe7b1b1d3db7f789dce
font_02_sfnt_off000128bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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