Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ee06b42436a14f…

MALICIOUS

PDF

85.3 KB Created: 2021-06-25 21:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2ab0f3e62ae5a8014ec40de6e648151 SHA-1: 1f2ea19a489b7442f768f671f045eb4df4a4d6f4 SHA-256: e1ee06b42436a14fc479b3c619ceac43ae996bbe4be619d1e1d8d5483c9e9c1d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the download and execution of further malicious content, while the link farm serves to obscure the ultimate destination and spread the malicious files across various compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hbleg.com/admin/userfiles/files/kariz.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732ddc3d60a---xurowanego.pdf
    • http://deurenhanger.nl/userfiles/file/78786284695.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffd6d2ed0f---82135183943.pdf
    • http://pallenberg-busreisen.de/uploads/files/rokudajunopexumerodada.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/janufuvubamiwepulolabuved.pdf
    • http://csc-0411.com/userfiles/file/20210616132200_5escgg.pdf
    • http://rolmech-strzelno.pl/Upload/file/48292306634.pdf
    • http://artside.org/data/temp/file/rukopureki.pdf
    • http://tgtech-auto.com/userfiles/file/wofuridorajuwigoximarede.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609719a345b8b---tologinabalutovaje.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160786b086df5b---85253179124.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfce804b5c0---57630318633.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9e036f8c1---57461282009.pdf
    • https://okna-stv.ru/userfiles/files/bafadanunu.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc1d2243d8---mixiva.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7facf05c41d2045bf7dd2d95bb60eea3/jokaseritazidib.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ba8019be726fd40130464f20407141e/zugenoni.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/v8h2vh4rpkpojcl9bltp0bh91q/rirituw.pdf
    • https://ilcaminodaugo.it/file/tijegemutotupasizuxori.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6096a4819---vutikejogudijajuripigozol.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/vnm3t70350aic71vqu0osrshg6/31209400843.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/90408143482.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/rp321d3vcsh8cne6npk878u514/98866057832.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=business+analyst+in+healthcare+domain
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d0fd16a93---kozofakudatowivasoxulip.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_off0000eaef.bin
1ed9fa2454cdcda9c3ba4449b1e8524c315b6753fa1e49501d24af46c9990cc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEF 16924 bytes
font_01_sfnt_off000116bb.bin
f1df47f2af47b9490100ec03f9fba58c58a26dea0588d4dc4f888cf9ee520990		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116BB 10904 bytes
font_02_sfnt_off00012fd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 16792 bytes

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