Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee683f90d45a190e…

MALICIOUS

PDF

93.8 KB Created: 2021-09-05 15:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 30a190739fdcdafccc8761cdc8f794f4 SHA-1: ef75763263468e08797a95a1c4a1f2ac8ccac62c SHA-256: ee683f90d45a190ec677d89bc973b1cce2cb2e1e5aafc5d89cd0201651ff219b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the nature of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e9e2824082adc884d708213a1b6b12fe/lalubojopezi.pdf In PDF document text
    • http://paitoonbox.com/userfiles/files/tuwuvux.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/pumusuzuvo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/80731e671c0fb38a0449abc7b7028c0b/22907536136.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/walomasuxep.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/5522140584.pdfIn PDF document text
    • https://onlinendttraining.net/files/zitodojobifotef.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/50939100413.pdfIn PDF document text
    • http://kpnamboodiris.com/userfiles/file/15291558580.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b97302894c---dozesurekovitodarewab.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/1fa3tp1dntea23t4dmmp1un97q/94915348096.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/af35b6686699da7fa34b68be3f89ebf3/tiladakarekaxewep.pdfIn PDF document text
    • https://clubsportedinburgh.org/userfiles/files/46646176754.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/nibix.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/lixadukipuromexa.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/pinoderorosobafusekik.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/4kjbomcv2j32de1rp0v6vpqpk3/89944562233.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608058141b051---50376352772.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce464b858---85356653284.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129b9faab954---padupewotibol.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/92175751896.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608d65ba953b2---xufusifigetapoguxuvux.pdfIn PDF document text
    • https://blugarden.eu/file/79018616789.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/fdl1k5espfamnta8229hfptsul/xukezewigufawi.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/91b68a1e47dd1ac73b2b6827a6aa926b/5212178970.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106111131514966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=texecom+keypad+app+manualPDF 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_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 10588 bytes
SHA-256: e4aa5f2a20bb254636387f093778234e2a1aee97d15496410738ddc291ce71b8
font_01_sfnt_off00012457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12457 17192 bytes
SHA-256: cf9f7b2ff689cca1218ce88ff9ad3ec7c0e31a6135d5216090b37e0daed278e4
font_02_sfnt_off00015154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15154 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1