Malicious PDF — malware analysis report

Static analysis result for SHA-256 e24e06ab53449448…

MALICIOUS

PDF

86.1 KB Created: 2021-07-15 13:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6f5a5f1a6e261cc1e4483e8c291ac033 SHA-1: 9b368a25e0ae3a456bb56bd276197172d8b98646 SHA-256: e24e06ab5344944844cea9135ba0e50acc95cb73bd155f80200ff248121b993f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The numerous external URIs, many pointing to compromised WordPress sites, indicate a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://chcial.ru/uplcv?utm_term=what+sound+does+the+turtle+make PDF link annotation
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/2b894265a8c1611462dabf210d2cab01/vufox.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dilakovenored.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65fb4afe79---jurowifetup.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/5ur9vn7mtgghvckg6dfubpek7i/17793369933.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fb5thaj69c304tb5s73qsnr3fe/13720260094.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/sufabejujajokalipokodinin.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/nuxelavenuluvesupukofe.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1ef0db1c5---83273213943.pdfIn PDF document text
    • http://m2m2design.com/userfiles/terozituralegixowixozaje.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bhtqntjk3sfpca9nd8ufv0mh3j/sowatuganano.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/29411119453.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e58acbd8b1---53289004075.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/86318521066.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081347264308---80414591847.pdfIn PDF document text
    • https://aashianarealty.com/file/1809794367.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/wijodepojabixijo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/b742b4a19ca91dce481c8324c43d59b2/gexowipiriragorasit.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/tezelaxuduvaxuvunu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e607987e659136b72177c28d8c9e8482/sokifalixelufit.pdfIn PDF document text
    • https://tekartltd.com/upload/files/51535277031.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f3ec295c75850f530b44fd1af45b28e4/tafadexunakituner.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5fcaa7882---12161515380.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b366f32c125---dejolutuxilaxesurumaxofuk.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/bewemo.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/gulos.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/49950699349.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c59788041c---wevemaf.pdfIn PDF document text
    • 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_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 10608 bytes
SHA-256: b5b830889fb8ec71a3b399f094d40c7e42306227cab0f14f9ae110e0a81038da
font_01_sfnt_off00010476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10476 17260 bytes
SHA-256: 61c3c1147a05295a21c4a379221407ddda9e4fe4ea82d2d5f8b5904423d2a09f
font_02_sfnt_off00013132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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