Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1f278084a065a0…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 03:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 948be104561de3db5ca770b5a0926933 SHA-1: 67f23d3927f8034b491cfc75decd25cad58f8e79 SHA-256: af1f278084a065a013f4aee0ce312e1cfedfc92626bcf6d8d5d77e741765fa92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage existing vulnerabilities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/68721579035.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c94bb30989---wirufinizinuludiwuvijuji.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/vavexoxive.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/74570633280.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210911214614.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/pibewuloru.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/43700563012.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/tetezajadiketenugamafaz.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/32183093849.pdfIn PDF document text
    • http://yepuco.com/uploads/files/laxakenatimekurajamuwele.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/mubetuluxar.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/601d473b175fab63200b64bb6279c89e/59005985229.pdfIn PDF document text
    • http://laduses.nl/image/file/karevodopafawumoze.pdfIn PDF document text
    • http://chapelguild.com/images/usr/zudis.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/tefexuvup.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/7791335070.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/77l99fkocju572io2kt40oh84u/36226540905.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/firugafalupedum.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/84928994024.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/40234069994.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/gubejozizelova.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161364f301d209---sifaratos.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/85049702252.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/tawawi.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/64536506677.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134844f592f3---19936723186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=super+zoo+story+gamePDF 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_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 10700 bytes
SHA-256: 780b01bb2651483b2a3e3f0d4027d9f5104438f5200f319c34fd9505892ac7ac
font_01_sfnt_off0000f90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90A 18456 bytes
SHA-256: b456b75ddf836eadfb04ae912ad18e50f3f342e4654ae9b2c830b97cf84b9305
font_02_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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