Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a09b502435eadef…

MALICIOUS

PDF

77.6 KB Created: 2021-07-16 21:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 544297da7a2945b0a50bb46987012c8c SHA-1: 52ea127b8844bbaa469a530f4f6f579f314d5440 SHA-256: 6a09b502435eadef15547fe4a95940d7fec9eec6e310198534955a59248ec48b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations, indicating a link farm or redirection strategy. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no executable scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/21db702df2519d62d6135a8632efcdc2/73714142504.pdf In PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c693d94e12b---fufuxetilij.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/p19tkasre0mfdollfa5virptr4/juxegopura.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adaedb46456---37444495198.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c1300b263ce---57589086095.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/87377422119.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/39465578757.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/n468jlsjq0i3ab0sdcadft473j/jetamuxifenus.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0dd7deef2f8b0af658e70f84bf03a2b3/mujovisof.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/vokoxumazazujede.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb498b57e5---48761571211.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077272155332---delilujo.pdfIn PDF document text
    • https://clinicscrm.com/img/files/93459028235.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/88002055756.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/21122673825.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/pupuve.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///37102933426.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/35820322215.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/25932496507.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/daxegipitovababibomupuja.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0ddcba5e---giwesowajopoti.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/1bb69fa63d594beda412deb255f4ed38/69408725249.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/jelofop.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/vumefedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+tell+if+a+graph+is+inversePDF 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_off0000cbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 16984 bytes
SHA-256: 05012aea571eca03d126f4534df1f05f46a40de9f3f9a480465cdf4197b4dc7c
font_01_sfnt_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 10780 bytes
SHA-256: 9ef696ba373fa9b967ff43493e720d945105a60e5a40ccccb0d6ef6cb81e673a
font_02_sfnt_off000110fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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