Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fd4d0aa8002cb27…

MALICIOUS

PDF

84.2 KB Created: 2021-07-03 13:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b525554eb8cef6e3ec9b9b3d12ad5c1a SHA-1: ee2aa13cee87f1132d2c4d94ef6091c9c3deed15 SHA-256: 9fd4d0aa8002cb27b2beeeb77b9f6338c19242734819bc72067fde3f3246106f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, and is detected by ClamAV as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ed8a29265aeca4481670c23d2b5659d3/2904021238.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/102eba3f684ba9ebd294f42ae5612a9e/vegaxozorafo.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s4arvf9l0p86akjuabhkco3mn7/nokabi.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bclr2doddr4m3v3e987fh28td3/50852518747.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/55dc23b2022aa133c3a75615fe76e77e/33232735552.pdf
    • https://securityguardsupply.com/php/uploads/file/mejenotiwep.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16200513403456.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f4bed5e8604396e8ccde7d1e7c38eb99/34413593430.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/84514521857.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f027eee082---sevub.pdf
    • http://zatacorp.com/upload/files/12980819420.pdf
    • http://adance0112.com/upfile/editor/file/pasuwozexadeviv.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/wenomi.pdf
    • http://www.aportecnica.com/imagenes/editor/file/dogonobixezaxilewixara.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9394e79b2---lugatisowizeno.pdf
    • http://vieclamketoan365.com/upload/files/46701879486.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073736dbe7db---rasuxinudagojanoferarebi.pdf
    • https://inncredel.com/uploads/manijesiredozebafox.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8c87b8c9fcfef5d4baa64dfc69a8942/58251465443.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/81baf853e8de1584b2f80086d46f97bd/26050636061.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=impact+test+charpy+and+izod
    • 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_off0000e319.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 16792 bytes
font_01_sfnt_off0000fb30.bin
e846b624fb28d40f5a9d9c156d05e756f422a67678210d9e95875435ca87e694
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 10860 bytes
font_02_sfnt_off00011428.bin
42aab01d9da9a8ebaa4d51a1c389f721b4ec3d99a0a5cf39681bfadb03b432bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11428 17980 bytes