Malicious PDF — malware analysis report

Static analysis result for SHA-256 800c8653b022aca7…

MALICIOUS

PDF

95.5 KB Created: 2021-06-27 07:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01669a93758d7cd4b2a254dbbff0b98e SHA-1: 9691eb7ca897046df06190d55bcd2a428bc32de7 SHA-256: 800c8653b022aca7c6cfff77f4e7223c704462c17df52e8eab44d0b150ae8316
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness. The embedded JavaScript likely serves to redirect users to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905b231b54e---jeturoge.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882b1d31613---61698181690.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/81253916778.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac85d3b4553---pafuwomezomi.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/8dfe44688ef506cb0415b924bb83c244/zawikizozoxukamuwijasepuv.pdf
    • http://budohurtsa.pl/userfiles/file/40525774822.pdf
    • http://dobrasekacka.cz/userfiles/file/kiremosujopogapelofise.pdf
    • http://greenplanetnepal.com/userfiles/file/zelegivakimuret.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7cb5d69a5---segax.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/35162328160.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/h81kdnu9med1c3avnbeitq3cjs/bisomurafeji.pdf
    • http://alexlunacoach.com/img/editor/file/xewegowikovotitapubowinu.pdf
    • http://gemculture.com/userfiles/file/14916948165.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081b69049aa8---56070486843.pdf
    • http://sjar-tech.com/uploadfile/file///2021062604315537.pdf
    • https://cowichanmusicfestival.com/userfiles/file/buwaf.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/bj31fjq5sdk3egbp1aacctlgou/bizerogupigawokufezogun.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6cc3880a4.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/36c573afc70175355c1e40afb7743309/vogirevowil.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/2ea582e56ce5495f4a9175d766d9290b/rafiranagapukogenuna.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bc44l0vlcgnh60bn1iot489ci0/47423662956.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b7e1892ed5a67baeda41842ffb6054e2/613973034.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc2614c31---dajiwenaxisemo.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf7189c42---78454308653.pdf
    • http://ijdssymposium.eu/upload/14829544032.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=airway+to+heaven
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbe7.bin
27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 16160 bytes
font_01_sfnt_off00011161.bin
1439710041b71693d7af7244db9b95663d296ffc42a2fb03d8cdd0189c535ee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11161 10240 bytes
font_02_sfnt_off0001286b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1286B 16792 bytes
font_03_sfnt_off0001407d.bin
32ed8849d86047e53b8df491e74833fd359b8c0c0e1e9045ecad9eabae885897		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1407D 18724 bytes

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