Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cee567060a5900b…

MALICIOUS

PDF

112.8 KB Created: 2021-07-10 06:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3d8d486b7ac8f4ec79c58f92e4a3fb3 SHA-1: 05c4ba956c2d2761bf0895dbc1b216f81d466d3f SHA-256: 9cee567060a5900b625d9e20fe1ddc7f0f520efb7d3acbc075f7b79a57160eff
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to host malicious content or redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of embedded JavaScript suggests potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b41ce60b561---8234805696.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/69b802faae23da823f08f403091de2f3/sutipinifikafiwuza.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3e6e1cbb3e4d2329f0b6da108d3803d5/zetifowozemefamu.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/80ee146ccd33f18211528109b9555cd1/notilapuladi.pdf
    • https://eldorado777.ro/upload/editor/file/lobojojezawowukonipegonaz.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e3d81a2565bf82cb280a16c66ea00a1/3196406360.pdf
    • http://stroisvias.ru/userfiles/file/neginawakolerogatugiwozev.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/vujimuxajedetup.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f74cefa2---59758362786.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609c15af86ca9---jovulolujivazixug.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b190f35ae0---pelon.pdf
    • https://tsegypt.com/file/sojizisur.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/xoxaguzuxuvowetezorusuf.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/c6gedlttk9hd79hjjfblfjr6k4/41790204407.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/xefaputuwu.pdf
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/79038799517.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bbb59e64759efad92cf68017e6b8b114/supixukafa.pdf
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/57246823228.pdf
    • http://headrepublic.pl/images/files/24307364604.pdf
    • http://londonjip.com/userData/board/file/17041991142.pdf
    • http://unioncentralreunion.com/clients/3/3a/3acd25563584ef55397927d4124196c4/File/24540262825.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea8b8c4dc---suluponesopurijo.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a655610422---57492582410.pdf
    • http://radissonhoteltraining.com/userfiles/file/43447548671.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=use+counterpart+in+a+sentence
    • 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_off0001575b.bin
395db91da508a0961c22c051fc6662b610ecf8f5963a7a9936922205c3a47ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1575B 17988 bytes
font_01_sfnt_off000186a3.bin
e072e5998c875784db3fbcf2658464e8d67d403e9d0e120cbf947074d4cc93c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x186A3 10428 bytes
font_02_sfnt_off00019e6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19E6C 16792 bytes