Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce8321c90a9b085…

MALICIOUS

PDF

115.8 KB Created: 2021-09-01 11:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcffff55eab7e0b1b9ede776d1537423 SHA-1: 50d03b137feef3c595e39025a24df4c6b4c3433b SHA-256: cce8321c90a9b0858e894c7bcef93a50eaf430a099a932af55ffbd3edece7ca3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing an embedded JavaScript stream, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The PDF also features a large number of external links, many hosted on compromised WordPress sites, indicating a link farm designed to obscure the ultimate destination or spread malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://ketchas.ru/uplcv?utm_term=best+leveling+spec+for+priest PDF link annotation
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/30198119260.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8c4654632---gawajolutuburagete.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2c9654b4169bb32584551e12578855c2/47454060009.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160810246baef7---zowuxagoserut.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/23707728918.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/bilet.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/47263515230.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc67e93169---fusozorujadogojakenopo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1610c0ce4501a5---ronumuwetabalevobi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93f473c1b---badofagesares.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/e82bf8a272fee9e1c28d3f45f3deefc8/mefijot.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610901f4e0020---bapubejutexuw.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdcd3bca5a---37059164924.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/vedogawuxibos.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161297236a8921---dixor.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/382041822f13f031a41a1e27d23cb4dc/20741417777.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/bolemiditakip.pdfIn PDF document text
    • http://duralinealu.com/upload/files/50765238866.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612148ed39066---74960533.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/f700a19671169cba61a0a7950275dbf7/jadewoferug.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/90693365834.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/fewup.pdfIn PDF document text
    • https://tosto.cl/ckfinder/userfiles/files/jofolujasutawikokiba.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/siwufenipekoxapopidu.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/famoxol.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_off00015d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9D 10612 bytes
SHA-256: b3fbb4d4453b815bee7a3343afa378c76023eff75f56c7bf9d113344010c4652
font_01_sfnt_off00017606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17606 18476 bytes
SHA-256: 6a98071c260d2050cba2bd12242232ee479108e4bc624dbc525ada3601278f28
font_02_sfnt_off0001a66c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A66C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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