Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc9b7d4242ece284…

MALICIOUS

PDF

71.2 KB Created: 2021-09-27 18:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf1e1fc92be1387c3a7059444e3d5b2c SHA-1: 521924bfcd064c3bb816f5a30165f9563711e14d SHA-256: cc9b7d4242ece284ef51908918a2ebb4160aa4f48b857eedbb11e05fecf16b24
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to exploit kits. The heuristic firings related to link farms and compromised CMS uploads further support this, suggesting the PDF is part of a campaign to distribute malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://philabc.ru/uplcv?utm_term=how+to+upload+photos+from+android PDF link annotation
    • http://shengyaweb.com/uploadfile/file/2021090914451947.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/57299636023.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/lived.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/73721795027.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/96546627550.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/mezulamegum.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/wekatobejexekixexidu.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/japejuvobilivipex.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae2497d3d2---mamukesusarodeda.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/ditovik.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/zoxikumegelaluj.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210901084958.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/58627687737.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/5786349327.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/14917943815.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/wuxofolenaditefeta.pdfIn PDF document text
    • https://0900107678.com/upload/file/vanone.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/69237889352.pdfIn PDF document text
    • http://eur-idea.com/userfiles/file/60799054642.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/65783930429.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/5ea97997d63fa14e0eb0d2ca4e4db6b2/48456473093.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/79304300947.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161414e6f3f154---kifazorof.pdfIn PDF document text
    • http://primaneighbors.com/userimages/56374737825.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_off0000b463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7A 10808 bytes
SHA-256: 304696f77f6331ce5facb6738500483fa00db3152b76a6bdefb971a6e16ab162
font_02_sfnt_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 16536 bytes
SHA-256: b0a46898131e40200fe0199cad820ead6ccc8e2baaff47dee6e8b0438aead8d9

Open this report in the interactive analyzer, or submit your own file for analysis.