Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0caeade5e77d8ef…

MALICIOUS

PDF

83.9 KB Created: 2021-06-29 02:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52dbcaae2c6b02d89dd0cc555706a09e SHA-1: c4f5539528808b5364f7414402590bedb67555d3 SHA-256: d0caeade5e77d8efbfd6f2561df4bc89a054827a7b92e296ce9633be49f3377c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and a significant number of URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=concentrated+pv+cell
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/kamawuguwemu.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfa048042---penowupebanafiti.pdf
    • http://ameshamagazine.com/js/upload/files/rasifatuneraropus.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/73nav6r19llmhh1m3tpniju1j6/miwudatodujuvivip.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/3l2c45h9pc7fa1udng50jm515r/pikarumesiwasifusev.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4b48bd4d228bd571016b2ad196d38078/62211606752.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80721420c---govemuvikugusilegizewexob.pdf
    • https://wotfiles.com/ckfinder/userfiles/files/51838888337.pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/19905114094.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3e7809210---nipefukagoxapuferi.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c9c6a4d65---gosanorizivejunokofanopo.pdf
    • http://dynamic1984.com/user_file/file/29138807737.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b92977039bb---17011156681.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3sdg9mker4950o81fs5q8ji883/jegore.pdf
    • http://clarksville.net/wysiwygfiles/file/69001084182.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae9d808fa---46855143359.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720611ea6c7---nezumafukinatukiwaxazul.pdf
    • http://www.tokyomagic.jp/images/library/File/wopozeramerenepezutipek.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070638bddde4---dozibofekas.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0788f920---28565409035.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758b8cd7973---birabaxosota.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816cd11d3e0---xixipem.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7567cc592---22001819837.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c794f2b3c9---64119815781.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_off0000e3c2.bin
bcdda0268fdaf1b6e64e29d06db6ec7449ad76e4e2ac717445a36c729da63a9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 10344 bytes
font_01_sfnt_off0000fb46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 16792 bytes
font_02_sfnt_off00011358.bin
b8ff1bf5bdec1e0278298a3da914fb645decff9cfd29e3f51c4f6380a58666a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 17860 bytes

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