Malicious PDF — malware analysis report

Static analysis result for SHA-256 540cda206987ef09…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 12:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07248bd32c7f5f98e6409bc2f10fb66c SHA-1: 30b621e1e15ab39a5ed92f399c3e6d57601cdbf3 SHA-256: 540cda206987ef09a304f9e08dd2066ddcc3e47ca5b55e94d2e41bd0f4f0adfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to compromised WordPress sites acting as link farms. These links likely serve to redirect users to malicious or phishing content. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4a5c8d09dd4198d6536808859e407777/sideferosekofuderil.pdf In PDF document text
    • http://domgr11.ru/uploads/files/60685159911.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/27398433939.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/63481579078.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/57170610607.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/dazatosulumizopujatog.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/xijirevawekipaxubekid.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/naliluwunudivipebuzizumer.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/94766368897.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210916_000207.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/10009905227.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/24442723995.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4f0df2f89---moravami.pdfIn PDF document text
    • http://kelvista.lt/images/files/96243636690.pdfIn PDF document text
    • https://producto.works/userfiles/file/foginajoledur.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/19024742218.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rdasm2kg5lnoou2r9r2jgh1g3g/30041203371.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9bfaf3859---suxibozisidosolifufezoze.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/kezesisogeviwugenugu.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/26387291068.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/49681095341.pdfIn PDF document text
    • http://asqcert.net/files/files/pugixiwixilatovagigo.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/39684936408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=paginas+para+ver+peliculas+en+android+gratisPDF 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_off0000e066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 19736 bytes
SHA-256: cd85141bb11fcdfa9fed6de6060f1baa702b45493e5fd7a05638abf23fc9d07f
font_02_sfnt_off00012aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA0 10856 bytes
SHA-256: 5a00ac587a9da540cf62a3166cd05b114f8003dbbaca195ba777f4a4f1d215dd