Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d29eab8952affde…

MALICIOUS

PDF

96.0 KB Created: 2021-09-15 01:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e30659585643f377063a072602d15acc SHA-1: 621a4c55e095dde0845690e7b58ca96a4a7472f4 SHA-256: 3d29eab8952affde9b92fd4438ca8ed579bd93c8e777e7cadf07178f19562cf9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised WordPress installations. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://medvor.ru/uplcv?utm_term=aot+live+wallpaper+phone PDF link annotation
    • https://t2sc.me/userfiles/54333340399.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/jekeg.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109081054042989.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411f803bd00---vusesosimitexelupunowokub.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/morofileribubiwoxibaju.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109021201327514.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58861425379.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/49471271701.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c27b95978e---guditogutebigimogagogikit.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/82921516367.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/8147368616.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14385899363.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/14500164075.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/85524044597.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/kinadakubupebox.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b11416deb6bfe9bbaba0ae276ee2f60a/vuleguxiwifupunogez.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/vepib.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/20415540473.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/sanugemegoke.pdfIn PDF document text
    • http://vettercycles.ch/userfiles/files/vinigotefi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/tul28461p1emulfn9jdre5uji5/buwimopagi.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614118d42aa2d---xogejutedowiluvikepuv.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0d0c1919f---76842784608.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/53552504669.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/19688195981.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 10312 bytes
SHA-256: afc4f8c4f43857f976f415486be0f690993e56154e1c1c9cc2962df4d7d2dc06
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16380 bytes
SHA-256: 4f2409aa88bf6b583f4c224dcbf42814dd3cebad97f75ea1cff0e3a51ef31032
font_02_sfnt_off00011ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001370a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370A 23196 bytes
SHA-256: 7c9f53baa61087e0d353a98cd83da5c15efba59286797d4c51d3be6e29d58a45

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