Malicious PDF — malware analysis report

Static analysis result for SHA-256 00a9c1da89b891a0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-04 17:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9cdda878a65f1076d5326c12147735f5 SHA-1: ee66fbff3251e37aaf7383848d0f5edcc8433539 SHA-256: 00a9c1da89b891a0550cd81bccacc51839f5c7a06a67dd78bc0acfa944cb95a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and link farms strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://crysiq.ru/uplcv?utm_term=gmat+club+grammar+book+pdf PDF link annotation
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0a42183e0b4a19c0bc70ff4e0be67905/88590846636.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075c667dd961---80371882402.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/5045972507.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f607c08f3d---55148344843.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/58067794633.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a59dddc7e00---59968295714.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba97edb0035---94018981170.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/4f24bba655d06d611946550b35916a0a/65098512585.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/d521e2a7fca2f6e816ffacac9642a25b/2427482167.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/24a6ba0b3aec5f9965daa10d56f65772/depunibitodibobigeje.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7519ad7de---zewakapirutodanabi.pdfIn PDF document text
    • http://aweibel.com/Photo/file/luzinotujolavelib.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b522d7d6017---tezefupo.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/63093836641.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/36186605803.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/96159916018.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zaginedarubob.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/sumivokevanigitos.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ecf22f1cc---90562358703.pdfIn PDF document text
    • http://teplospectr.ru/images/files/20472015504.pdfIn PDF document text
    • http://derma-dts.de/files/file/82993290405.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/vugagurasapapabat.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739256e3c4c---80786809521.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/ketonug.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/25335364432.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f93b8a696---lufusavaw.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/25bf900a30541ad921bb5898525d4474/80229258435.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_off0000b8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EF 16296 bytes
SHA-256: 16390a2c83c711441aa1158ce3a57258ee9f951eb046dc809509ac29bc33d7b6
font_01_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 10836 bytes
SHA-256: e169365d6ea12ccd382de2368652151f9985304fb7edd6addf4236256eb18fb2
font_02_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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