Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1ed5f9242b214d…

MALICIOUS

PDF

94.7 KB Created: 2021-06-29 02:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c46eaa2355c44ea5dd6c5a74e02439d SHA-1: 7519f728d7a67293f042ef96e545b6e77a1e979f SHA-256: 3a1ed5f9242b214dee0ecc8f6238d6961926b2a099b356de8e420b2a664d9731
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or distribute further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://palyavalaszto.hu/teszt/upload/file/68673475349.pdf
    • https://vibangnhadat.com/uploads/files/xexik.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ad2e72f627e3c4e660269f9365c1c62/punut.pdf
    • http://jentretiens.ch/uploadimage/rufukutelixelawitimebadej.pdf
    • http://kurtoglumob.com/upload/file/dizusarux.pdf
    • http://brandiassociati.it/userfiles/file/pevadujikuropawu.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae44d0be5b9---vabitapideragezovidema.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/35egj3j62o27ph9td5npfl5fsr/28229987727.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9em37hlptqlk3so4dnloe15qej/mudapaxigotamoriruwe.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42eee85e8---40027881674.pdf
    • http://ceomit.com/fckupload/file/talowugewo.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607163e1d48f5---masetejiw.pdf
    • https://sonarmusic.hu/up_image/file/89875526490.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/65046529715.pdf
    • http://hrzservices.com/uploadfiles/file/vupiku.pdf
    • http://tomaszskiba.com/userfiles/file/11783426319.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb94f238c57---33784477097.pdf
    • http://czdashan.cn/uploadfile/file/2021051223515473499.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/8ftbngopb1om3oanqs164lqt1t/posuvuwaruti.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a73460cd7216cc2e856c9a4e807e910/wudexivizuwat.pdf
    • http://agcslohian.com/userfiles/file/kuxavemisafobivezozubig.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/8c695431aab97360d75c9e6348e036ef/72929367079.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c77114e4c---84743740581.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=multiple+myeloma+affects+which+cells
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001100d.bin
6c126683067eaddedba7ed9d8303354f3dd3716ecf3d2f30298538b1c73785b1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 10836 bytes
font_01_sfnt_off0001292d.bin
8146cb6f13511b1c1cf90593de12b6c1487610e1b1fc6eebd90b50c27bf47627
pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 16408 bytes
font_02_sfnt_off000153c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153C6 16792 bytes