Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c0a45b95862459d…

MALICIOUS

PDF

77.7 KB Created: 2021-07-13 15:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 94db3c9095a30acb52fe0f71512ce841 SHA-1: 6717a8135a90d8244b2f473af75df0412eda8705 SHA-256: 1c0a45b95862459d55512b87f6ce2f7159f34dc71cac20bdcd1a573d14f1fab7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://anfauglir.com/images/file/munur.pdf In PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/zewudivevogurabifolujimi.pdfIn PDF document text
    • http://fittbike.hu/files/file/57352401763.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/989c967e6e1002b19bcf25d0162a9f8c.pdfIn PDF document text
    • http://inncredel.com/uploads/46343260129.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/51lik8s377kgmguga88igtsk2l/57606770137.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/kasofozerufilagag.pdfIn PDF document text
    • http://www.celso.org/download/62575561620.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/41144892940.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/22934372582.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/buzipo.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/cfb21db0875290dd65073948c1ba5bf5/98781625133.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lesemiwinexodezuzabib.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/1385396262.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/6lc6e5nnql7m7qkrku0gkjai2g/mositisisitarepubalu.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607715c4ea2dd---takazebiguxotamek.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/96332359285.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b601d36ba7d---76923164552.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/65513838112.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/vegipedejarafido.pdfIn PDF document text
    • http://kleiberit.ru/files/file/88471006337.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0a86fb0c---senatoximewadekividibabe.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/temefil.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ebca489b4---beladajitoxivojolisum.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/f6e26f90a36b190e0f07863a4219eccd/63158746002.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a08785ab---wuzewadasetebudutatire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=multiplying+and+dividing+fractions+word+problems+with+answersPDF 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_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 11568 bytes
SHA-256: abdedee5e828125c9d6a080eda11328140d76300a602a98b7205c91570fde90c
font_01_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 18308 bytes
SHA-256: bb863d577b5396f877930968e8dcf6ad5fc8b3f9b2827444757919599c2bfabf

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