Malicious PDF — malware analysis report

Static analysis result for SHA-256 e936e03567cb2a1c…

MALICIOUS

PDF

87.4 KB Created: 2021-06-30 20:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 418ac854a4815cba7fba416ce90e32ca SHA-1: fd294b3d98834f88a0703f87e26ce34d0aba838d SHA-256: e936e03567cb2a1cd75955cbad9ea24bacc2765dba4c1a3582b3da1e4fffc81d
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure strongly indicate it's used as a lure, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://hgbs.de/userfiles/file/tibabeberitu.pdf In PDF document text
    • https://agrilaui.com/userfiles/file/36858195312.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609422b1279ac---fijalapa.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/49355218656.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/63469062594.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7beb126be---risedakexofenosebimowaziv.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/12603990902.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/8c1f190083dabf0672023821f95be19b/bofisojufa.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff06ecd8d5---benebikilar.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd679c66c8---ginugixino.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/57043944770.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210603062603.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/00d7ed0831d511c4b1dcfc67a3373525/gikiru.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/fadezule.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a939c99791---56074280288.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/20326187950.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/45554911712.pdfIn PDF document text
    • http://novichiha.ru/pic/file/4105609604.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/75mvgn0ilf99ntnhi0gk7b5gpo/zulamoxujotobigeponi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f9e3d5413077531934edb109df175d42/bugorilenidow.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46a82426b2---zenitizovukitadofisole.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16f105a452---42388136765.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/ngucs8udg136bemtjgtlbgtpm7/37167986494.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607925fb6f2e3---59103894187.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/4ee7aaab449b7ff1cf3a735b7c61920c/kazuvedivulesikejakuduxag.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/26330042634.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/90244096625.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/jipomivusenabox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vegetables+to+eat+for+kidney+stonesPDF 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_off0000f333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF333 10844 bytes
SHA-256: a8f10b72c71d3a1cf5cbf0bdbaf46407b804c052e8470356e4c5d71e44871681
font_01_sfnt_off00010c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 16952 bytes
SHA-256: aad78c30619bcf5831560c1202bc35fae33c422b187e11dc6e36f3118fc577c8
font_02_sfnt_off000137cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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