Malicious PDF — malware analysis report

Static analysis result for SHA-256 4943ab2661df8116…

MALICIOUS

PDF

81.4 KB Created: 2021-10-11 11:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5de7d926b150a2e98d2b29bf4fcd21ed SHA-1: 374f9dd1d31a4b35bd2dcd8f559229e779f3a4f8 SHA-256: 4943ab2661df8116339267df3c2291b4e32d26efa76cd636da12ca2c17b071e4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external links, many pointing to potentially compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of 'cmd.com' in the document text, alongside external URLs, indicates an attempt to execute commands or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://krisoc.ru/uplcv?utm_term=yoga+for+students+pdf PDF link annotation
    • http://gurolmumcu.com/userfiles/file/97741483706.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613643eb53cee---morapegowizutulowifa.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/mabegotevixezore.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/vaduvoxe.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156fd60c4fa7---wajovetem.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/xewarurofuwibukimevipakat.pdfIn PDF document text
    • http://qdcmd.com/data/files/45891335413.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/dejufig.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210912_AA2DE9EDD23B290C.pdfIn macro / runtime command snippet
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/87689603469.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/36dcf9797fc9725fa53bca81e75937e9/20158612585.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/657346345.pdfIn PDF document text
    • http://hocomesun.com/upload/bubebowenunefegimewinoda.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/24209459082.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/51961203826.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/favufuzevokizolijuvi.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/98484894080.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ca3c9c87f6---76457110846.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/30113768188.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/noxorisefagefumi.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/dupod.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/gosaxuvimuxa.pdfIn PDF document text
    • http://didopack.com/files/piwes.pdfIn PDF document text
    • https://widerbet.pl/userfIn macro / runtime command snippet
    • 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_off0000d872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD872 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF089 10616 bytes
SHA-256: 5a1940c5c07b9dbbc0232e124bd11a55f0e210d49aa9100fab5dfaa0afcbfd5e
font_02_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 18348 bytes
SHA-256: 4abad98f06a756aaa9ede889f03cc6322228b0508e02d97fb2dd85ba0dc5e374

Open this report in the interactive analyzer, or submit your own file for analysis.