Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f8d48d25a809ca…

MALICIOUS

PDF

118.8 KB Created: 2021-06-11 16:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 9eb15d1b4298c08b1549b872041ff5ac SHA-1: 507088b4f17b1f2e032ef7596ff82f45c150863a SHA-256: 16f8d48d25a809ca508835def3603bf9a529158337c15345a6134d908c48433d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://krisoc.ru/uplcv?utm_term=all+fire+style+jutsu+hand+signs PDF link annotation
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/26ead765785e9946053ce4e3b88b64b8/mebaduzebozago.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083942956363---77628570551.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/208045733daa12a255db5e1b6a1b7aa6/2948034547.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe237e5b49---vikekusekodexesov.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/1424166051.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rpkiad65t9ill65998nlemfcjm/40032878661.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/90403211603.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f66a43204---3497334134.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087e814a0e4a---wemodavitemusowozokuluzes.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/40741993612.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/717b0fad57d0e7065f9c1fe42575a458/71983682820.pdfIn PDF document text
    • http://vce34.ru/attachments/file/kajos.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/rpkftau53jrnrg0tj9knh4k6vb/88317282793.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/jexop.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/veduxaw.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b4009109---satuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off00016ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF5 4800 bytes
SHA-256: c98573415655ce98b70ad80a96aa3f42e739d815ae533f2b3d808498b927d22b
font_01_sfnt_off00017fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FBA 5336 bytes
SHA-256: 2276c18e4bbdaed8ae0d18efc1ccb2d880f424be3fbce7631869950d6eb2f0d1
font_02_sfnt_off000191ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191EE 11044 bytes
SHA-256: 6a30ab1900c1e0338f6030471cba5578f7631c7e2aebcdf2679f2b0e4e898f26
font_03_sfnt_off0001b6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6B5 16544 bytes
SHA-256: 1b44218257806f750c7fedc2cca84b6b30ff477c2da870f9e14c0541087d9c9f

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