Malicious PDF — malware analysis report

Static analysis result for SHA-256 458d6227d04d68c0…

MALICIOUS

PDF

81.2 KB Created: 2021-08-01 05:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1c20e0cb9bc427526a11c422bc16b57f SHA-1: bfba8cc7de71dd87eb3884a57dc35829bb0ad90d SHA-256: 458d6227d04d68c0ce1c97398543284cae5a716fc3bd5dae64bd01b3e9e6b362
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, specifically leveraging WordPress form upload vulnerabilities. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2eb863c58.pdf In PDF document text
    • http://nuraski.pl/wsg/userfiles/lefugawadiwakovatuwuzaza.pdfIn PDF document text
    • http://3q1p.com/upload/file/2107070711131952513nml3cgfzh8e.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/17275063775.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160876cc542661---19452177088.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/162dfbbbbe9f23f6e8d283f5213f18c5/vokilujodejikak.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/loxovafagidefezevozes.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceaa916885---duxexuvuleremax.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/40d2d90d982cd2366a3bf9480b25c99f/12222416366.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/bivupidigoxiwepanovekizir.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/tegukezuvodu.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/fivilawidegavej.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1bdf9ea7dc16b78b1da1b8bd62e1ccb7/viximenakabalemakegitego.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/tanulorolusezomaxu.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160764423b13ff---javuxugusevadakexes.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/vaxetimetovopa.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd2628109d---xilidexuwexixunasanenijun.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe63dd7de---rukosozuzogazexorufikawu.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/6566357788.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/92293091994.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84c2833f2---sugusevirowixobudazi.pdfIn PDF document text
    • https://advik.net/userfiles/file/kofaruxob.pdfIn PDF document text
    • https://bauarch.bg/files/14696459831.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/rigelusiw.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/kezisadokuzevaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=ntpc+book+pdf+in+hindi+free+downloadPDF 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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 10844 bytes
SHA-256: f80d860824013827d91aa10df4fbfc2c3ff1b9339a5f6dc310fbaed914089c61
font_01_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 16752 bytes
SHA-256: 55ed4cb24ac77835c6920f47c3f61570e71e4de26898fc83d3fb17ef3798a789
font_02_sfnt_off00011c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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