Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c98a97e3527b56…

MALICIOUS

PDF

77.5 KB Created: 2021-08-28 11:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdfd5b34167ea772e0b6227a7db1e4b4 SHA-1: 4a64aff328460dcc6be890de6201d35fa1bcfd95 SHA-256: b6c98a97e3527b56fbbe014afefb50a03dd90342fbc40016fd9e7f98c0067630
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://chcial.ru/uplcv?utm_term=hc+verma+solutions+magnetic+field
    • http://muzycznescyzoryki.pl/userfiles/file/mexag.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/77u8et6dngqiff40vtq8qsksoo/49663855950.pdf
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/zuxakofovimogum.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/5lvlbst4t5rrv1brbvkeacj2m4/tiganufutufojalawarupa.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf50e9c9b2---mevedarulirabo.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/she9dsgvpo66i5gpd0denf2kps/67543321550.pdf
    • http://elfuklid.cz/foto/Image/file/lijunawaxu.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/vukupisezubukofivanixa.pdf
    • http://geometrabottero.it/userfiles/files/dibusezojepepexutetozib.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3b3ead1228---22515175998.pdf
    • http://demkapi.com/resimler/files/kalon.pdf
    • http://bygreenpure.com/userfiles/file/94223793017.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b0f0e8f64---90956222914.pdf
    • http://cuboni.com/uploadfile/hong202107281716024674.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/0edffe7ef622fc8240bdff02f3941595/90005522212.pdf
    • http://flirtproducties.nl/ckfinder/userfiles/files/mituxiki.pdf
    • http://thermogroup.ru/uploads/files/14613557794.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a77353490f0---ribulamizumifunufax.pdf
    • http://sanarina.de/ckfinder/userfiles/files/xobolirokamile.pdf
    • http://vstarmp.cn/upload/files/20210814_042248.pdf
    • http://stringpoets.com/userfiles/file/53876824418.pdf
    • http://arcomproltd.com/userfiles/file/fabuvi.pdf
    • 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_off0000c90d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC90D 16792 bytes
font_01_sfnt_off0000e11f.bin
aaaaaabdf9bdba3621614f66ab66b82a90ad2017b269aaf8e4298fcdfd9de0aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE11F 17172 bytes
font_02_sfnt_off00010dc8.bin
447813cf0275a64a9a3613c5eebd0af5a3954e1d8a8103f4f5b672f7d9aa98c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 10976 bytes

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