Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d780c4e919e55bd…

MALICIOUS

PDF

92.4 KB Created: 2021-09-02 03:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c266d710911c442c2af35207885a8309 SHA-1: 18b82f19dc89fda48399b6a6fdba61eb8fcc7a2d SHA-256: 5d780c4e919e55bd5bd1aadfbfa45dcc30f3f748795e48bde1727d2cae7aee42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate this PDF is a link farm designed to direct users to external content, consistent with phishing or malware distribution tactics. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=all+the+mountains+of+madness PDF link annotation
    • http://edwardlankin.com/clients/86087/File/bojularozukuvif.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/kejokibipuraxez.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/nubonafutitaj.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/42f927fd2f382878f3c54bc1d6b6b221/kirokapi.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/89611261841.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e77d1921ceecfbccfb85608cdf05754c/63536163146.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f64a767c9---gotawupamijefulonovafaj.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bo2riqifjtrdu3e3eea4gmeb3g/vuketi.pdfIn PDF document text
    • http://sam-global.info/files/file/masijojaxegefa.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/19277880668.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/nipufovi.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/78032971423.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ac466273c---8152002763.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/csoleoi4mhnkmequjflsq1ckom/74646384629.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cc17048f069a6a5ed116cd18faf8da72/vosatesujojefivenodof.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c15db0d50---76233991289.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/pivepa.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/14ebf3013c2c4fbcebee65ebdd670d0f/6186508300.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/91536287752.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/64254704909.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/enbigihlfan7pguq4eqn8ure8f/54794666094.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/gebexozepadotuwexumiba.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/futona.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_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 10600 bytes
SHA-256: e6dd1a4df4234b4c8d83f66ed5eb995c0ba0628f2534753794b09c9fbb9c2d1a
font_01_sfnt_off00011d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D36 17976 bytes
SHA-256: 9fafbc1aff734774c4e7639f98d2abb21ff4c98c791bba28b1c90d0989a25a1d
font_02_sfnt_off00014b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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