Malicious PDF — malware analysis report

Static analysis result for SHA-256 c46392dbcf7bcc92…

MALICIOUS

PDF

68.2 KB Created: 2021-09-26 18:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7326d26eff3ace19a62b7f08be6d024 SHA-1: bf6e45cf55ca8070206736810e566735e03d0878 SHA-256: c46392dbcf7bcc920f2dc5062a1169a83ae9fb9b0440dd16bb7d7e664b7291fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content. Heuristics indicate a phishing and potential trojan distribution, with ClamAV explicitly flagging it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pistant.ru/uplcv?utm_term=download+idm+2020+full+crack PDF link annotation
    • https://e-casainteligenta.ro/userfiles/file/xijazibujipepujipuzazowud.pdfIn PDF document text
    • http://hk-keber.de/images/file/66464163446.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/gakerisajofivivego.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc9425820a---nokeliga.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/jumopobujowik.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/3884375381.pdfIn PDF document text
    • https://olterus.com/contents/files/mawopazejap.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9n3ags3p6ghjatotou6u62dc4c/39077427901.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/ziwubapizet.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/4827348034.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335690d8204---50906134169.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/15228551388.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/24831558491.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/35607981888.pdfIn PDF document text
    • https://protraderin.com/userfiles/file/26914823910.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/34074256540.pdfIn PDF document text
    • https://limsurdua.com/contents/files/xufuwapubusinarumaj.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/97343777739.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16144303d5be09---noberiterarope.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/muwig.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4c7daba48---87641702400.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/89452751288.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_off0000ae29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE29 10760 bytes
SHA-256: 8a325cb740c6ab1056b287a3e92a015b8bb9c2aadd754c3dc2e44cf4b217461a
font_01_sfnt_off0000c6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EC 14552 bytes
SHA-256: 2cdc95228ed9d173081b95f7ac87cdc0306b668565e7bd4d46e5385c386db4c5
font_02_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1