Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa4c7813105ff95…

MALICIOUS

PDF

341.0 KB Created: 2021-07-18 08:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80f1bd093fda25c127274613d4f4ae6b SHA-1: 93e318cd5ddc815fb69d0119e6bfa27ff15920cf SHA-256: 1fa4c7813105ff959822531df949dfbb386c98d8c6971fe04229efec541ccf25
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external resources, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of JavaScript suggests an attempt to execute code, likely to download a secondary payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2f7452f07d081b1cf1ca9f3fa8cf2ea4/gofexaxerufu.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/c25728d457960f8c0a04ef68358782c2/15156178538.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/cae93bdaf95a0ee688edaef2c26ac8a9/budidokevubojeken.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7671369ddfcd2af5e88d3d7c7d334e4f/46762459509.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/72193503101.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/idkj4kh6vui5mvbh7b7p3h6rfh/74591638734.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/nugopamibifapo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9fd07849c---pomujiparodilopu.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/26745471161.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/peviwa.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5bac56e28---mosovawirovuxokurim.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608acd0234d29---3123445624.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/ckmrjgjplj7ptstocq9rflbndd/dupudukavigoge.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/razukijujuvujeza.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6751215e24---laxixafa.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc7e0219d5---didatimikozux.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/74597962325.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/pisezejefatag.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/sexesira.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1983b4d417---88674931421.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/90107816991.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/90018950233.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/givisodipo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1d1546775---6319052076.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a89c3ff5b---desamalokuzulev.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f55417a038---wilufukubatewusivelip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=return+to+paradise+onlinePDF 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_off0004e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E95D 10528 bytes
SHA-256: c35c3c0c82302e1dff9e18207052a5c2b07fc9bcba8a50852a6d8058375873de
font_01_sfnt_off0005016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5016A 16972 bytes
SHA-256: 37a936a6102acee51b30d664375a0a565d8927984fa94919fa1e3ddc0f47a99f
font_02_sfnt_off00052d84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52D84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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