Malicious PDF — malware analysis report

Static analysis result for SHA-256 240687ca59943216…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 22:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 874609eb0adbeafd759b0c46160df71a SHA-1: a87596771e5d1ad756f3a71c09c77fa4479d6530 SHA-256: 240687ca5994321676627dd6b3bc527ab209add1225828230db94a0a77367def
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links and disposable hosting further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9fd04cb5e---83284390873.pdf In PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/10797352069.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb8741e39f---76862537034.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/54658220046.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e80fcb86960823900b7d8506e3c4a552/vipaxemofozabuv.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dbce5049ea540d55e4b1da41f40284a0/pawej.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/53128469338.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/1iu07m11tmugsmvv88mn0ahj24/watekomemafirodorazewuris.pdfIn PDF document text
    • http://kccmaul.com/files/files/kapivufewelugofinujomenu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/aog7s0skpe051pj73k8u37jeda/mopoxifigudex.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9430b2525---52080065844.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc459738a---50593425441.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b149bfe4---pemitaroxokomowo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e61a75dc---32313354762.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/xipilulam.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/mebavo.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/nirug.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/mafir.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/30410112759.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/benutazapuziwefifutisike.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/18332535537.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/93516941599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sucesiones+numericas+para+sexto+de+primaria+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_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 19952 bytes
SHA-256: 9a68ba57e25446f607e075a36046170d51a636cb40e3cf7817f7851f9f11ced3
font_01_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 11012 bytes
SHA-256: 426d2d7478104d56e946d56dea4159ae8afb8100c94ca6db28df745ab869f77e
font_02_sfnt_off0001326f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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