Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf79c093892767c8…

MALICIOUS

PDF

69.5 KB Created: 2021-09-06 03:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d0dc91667d6c35302f3958b27e6b140 SHA-1: 4b9294ba54779dfd6f430531a84ed8e73765bd3f SHA-256: cf79c093892767c84770584f7bfa7cf3afeec176ab43f7330d8f2930295f46d8
184 Risk Score

Malware Insights

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

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various disposable hosting sites, including IP literals, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=english+file+intermediate+workbook+without+key+pdf PDF link annotation
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16086ba692ca77---2672239898.pdfPDF link annotation
    • http://goldenbaycruisesagent.com/userfiles/file/57515368685.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/44817545207.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610eebd568052---foguwumival.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/lonijanagadasoriv.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/lodatewet.pdfIn PDF document text
    • https://solturism.ro/images/file/nejunapixaporukun.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/25249073627.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210703061810.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/32796928360.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/17035204857.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ae64ac64---zubijafoxumivajud.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/78653195672.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d3d6638c---91967081324.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c0dfb4158---40008561407.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3c1ed5a3---86827281660.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/45297176221.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/18312868347.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210809_378368464B5030C1.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/917c71eaa4bf6fd4aa8e14de50454e32/xuvir.pdfIn PDF document text
    • https://akvaguru.hu/user/file/94973067258.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/40823582988.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/11591052565.pdfIn PDF document text
    • https://plasy.com/uploads/file/fepuwibuvifogor.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_off0000b1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 14592 bytes
SHA-256: 13139ff0edb2d963db51e47abdad791be0ad837671ca84d2570378dcb9046db0
font_01_sfnt_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 11460 bytes
SHA-256: 89f7b15d7074969fa98e045272616ac694d2810ae769c7c4afd9f374df0f9ca2
font_02_sfnt_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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