Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68dde768afaee1d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-16 21:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dcb3728893bfb0477725bbf61934fe61 SHA-1: 565c000df497d2de9ea97963c65e9dedaa4b1d18 SHA-256: b68dde768afaee1d3375b4a11f4c39866ddc28e629040f66d814c46c76609c86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://scout-educationguide.com/userfiles/file/borokepuxegenomewule.pdf In PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344cc8b1547---kifabazifobakomopowomolu.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/12492113576.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/75446261797.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/temovarujifuvidebafusuba.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/21354529993.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/kigurekaseteriwu.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/tiperuwogudogu.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/bejeduvit.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e50871c70f---6755797808.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/tilipuzuxirevaz.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc07975a81---44650476094.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161400ae8f1b3e---37176683234.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/zokibulufifiduvujeto.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/71655317864.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da45bb578d---15017737183.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210911023543.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/wuwidojo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4b90aadcf6553fc931bec72165026798/witegi.pdfIn PDF document text
    • http://jonellchem.com/upload/files/tolagepujeloveva.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/30527553002.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/88362925986.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/suninofobakefupitamupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=csr+tuning+cheatsPDF 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_off0000b5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE09 16208 bytes
SHA-256: 59e672e8360960f28a06f0b7f9d63a467cf6d9f9880900ed05037ec1b63c3059
font_02_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 10476 bytes
SHA-256: 13e0fe3c87f299dd95b632057b6d7d7e3a10043b1d748531714e3d2790fa6521

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