Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff58e330230dc34…

MALICIOUS

PDF

77.1 KB Created: 2021-09-24 01:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c6a68f919ba0b36fca4e2ba3db63f36 SHA-1: b88dfc7ecf5c319956a9cae760846a3e9bdf01ae SHA-256: eff58e330230dc34b769554cd1d0c8df977c9169f040d3b6ada0017088700fff
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL analysis point towards a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://qianxi.cn/filespath/files/20210915065829.pdf In PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/22750883492.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/4623042451.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/33360317449.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/46068672998.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/begobiw.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132080a677af---91309199611.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109160358474231.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/wivutenuxufigo.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/muralejojobodesodi.pdfIn PDF document text
    • http://portableandcool.com/files/files/mavibifuwatolamo.pdfIn PDF document text
    • http://hk-keber.de/images/file/gonitajelegesu.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c14b6b6129---94656503672.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/letis.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613340cd14ac8---japejivav.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614cf3e1c39db---titaguvotimo.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/vajorufebipezisej.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/gaxexikisonisa.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/33249980572.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/21551397426.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/rukatidopuvipojuwenepel.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/73719046028.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6cad88c9---13285522139.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=1001+activities+book+pdf+free+downloadPDF 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_off0000c959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC959 11072 bytes
SHA-256: 0c43ad100865810ef4a5f36b941d565eeda402752a257443f82ba009db6f8966
font_01_sfnt_off0000e327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 17044 bytes
SHA-256: fd03a18b5ae9df746fce870c07fc6e1982da96310e81c1a7dd61b79ac7ae84c5

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