Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56dff077b511860…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 07:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 123bd2a3c970f80844fa8676170d66fb SHA-1: 74ecde605e5d8c20036dcaad0e62086963ab313f SHA-256: b56dff077b511860f47d1fd987b4607678b6cb022f834fd8ace99a118a297bbd
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable. The primary function seems to be directing users to external sites, likely for phishing or to download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://csn-alliance.com/data/files/27955587440.pdf In PDF document text
    • http://msiutilities.biz/documents/87260537468.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/a4adad0bcbe7babc9e4679b3f8e8d297.pdfIn PDF document text
    • http://ippon.lv/uploads/File/71064875232.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/bazoz.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/852720c3be7f4cf83cd4cbe81c556226/nunodavebematupak.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/gimeverojogotiwus.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/59489086192.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/meliwidozi.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/zomevadarevetobidi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c62b677b8f5---xilusamu.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/43662579341.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b1e723d1c73fc065332364b7a6314165/69844243913.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a0fbbade7---susure.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/xowijekoximokudawilot.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/mejosobefidoki.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a15592e6ecc---82744300261.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/13528270266.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b226ce1bd286a7350335b5911d463c94/30800176723.pdfIn PDF document text
    • http://portsreunion2021.com/clients/b/b1/b1889431de095b9710a1303a3c619afc/File/jirijutesazozurefeg.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607391ed79dbe---26617154108.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/mavogidivedaduxebeviber.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/34d2e900f43be08d51638c5f525c6cf4/93429339247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=nursing+brain+sheet+pdfPDF 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_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 18208 bytes
SHA-256: bb25549c9a1263bc549f8c974597c8e74f23770c3bb173563d0eaa72a104e983
font_01_sfnt_off00010d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 10828 bytes
SHA-256: 5b648b56a6676ba37e1a9d29fedc0c7fdb2521cd7aca18a01d9ddf4c0de4579c

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