Malicious PDF — malware analysis report

Static analysis result for SHA-256 033e55658e253d41…

MALICIOUS

PDF

69.2 KB Created: 2021-09-27 02:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd5e61f9940e1de6e066cfefb8f04cfc SHA-1: dd5db0c9f92c5a3d585837fa0eb7a0d83f032ca2 SHA-256: 033e55658e253d41ab1086fe6bd8b75eaec6292208bad71a73bd4cd2be903f0f
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it's designed to redirect users to malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using link farms hosted on potentially compromised infrastructure. The ML classifier also flagged this PDF as malicious, reinforcing the assessment of its harmful intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6493

Heuristics 5

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://crewmak.ru/uplcv?utm_term=instagram+dark+mode+android+10 PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16141d42e61c2f---38337301867.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/20451221335.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/23807325693.pdfIn PDF document text
    • http://aurastaffing.es/upload/file/22722271856.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/49sc247r885hrtp524bi3630u9/gozujaninavalumimegoruli.pdfIn PDF document text
    • https://ozsahinotocam.com/img/userfiles/file/62447743041.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae2f3f3d87---bokafawozewejimujabivin.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/65517652847.pdfIn PDF document text
    • https://adikmanis.com/contents/files/sapis.pdfIn PDF document text
    • http://sjccgy.com/userfiles/file/75978563291.pdfIn PDF document text
    • http://www.toptehnik.si/images/18716731708.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/43715818097.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/kesatazo.pdfIn PDF document text
    • http://hak-al.com/resimler/files/41536920809.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/tibevulajalatis.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/52992621710.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/gobevaxe.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/jifinigetukazu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161424777bdead---40839652659.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/41079905971.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/kufugunoxipejaxeguvi.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-20/20210920170556156497.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/gobunirifaf.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/73168698523.pdfIn 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_off0000b3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 17752 bytes
SHA-256: 4dab53425118989675f5317682d04f0dada3d535987f859f651cfeafd1016bc1
font_02_sfnt_off0000f99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99F 10760 bytes
SHA-256: 75d37ef2dddd380da2dfa4a6ad69e2688500d2a16a7db468a996728b0e171724

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