Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf21e753fb956a7f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 16:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c635e600e3359b8612a576b79f33291f SHA-1: 4ede012c983521a5fc0bf24c7659e22713730e63 SHA-256: cf21e753fb956a7ffdc89c7937a9258f4494623bfb625e8c8c38d5937ec14bde
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to compromised WordPress upload storage further suggests an attempt to host or distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://aynadakikemalizm.com/resimler/files/majukubewobaku.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162a15dd10---24860280450.pdf
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/tobumuletoxalovamomor.pdf
    • http://dintainoodle.com/uploads/files/sutevib.pdf
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/luvasiwu.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cf387bf30---tefuxipokiwezijegudiweji.pdf
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/93311755853.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/xijenixokubezafuno.pdf
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/naribukitevavela.pdf
    • http://movitecnic.com/ressource/site-image/files/dujoridiwutibi.pdf
    • http://klhl.com/userfiles/file/sokonebiwibesobaxorad.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/56620708237.pdf
    • http://www.radio-kum.si/data/files/ligosoronav.pdf
    • https://csmgh.net/pevron/www/img/file/derugaxajepofa.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b027f28ed2aaa08fa4006cf4d4f1581c/todij.pdf
    • http://cleversystems.ru/userfiles/file/zelibagewipozelugitoz.pdf
    • http://fecoil.com/userfiles/file/daselarivofo.pdf
    • https://gizaviation.com/uploads/files/zivuserowolon.pdf
    • http://standardamulet.com/files/files/vufojos.pdf
    • https://aronabritcan.com/userfiles/file/kaxedolo.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d6a92e0cc---1434864660.pdf
    • http://canyonmeadows.org/userimages/bobabugiwixaxapodol.pdf
    • https://fallahi-sch.com/userfiles/file/jaduxejijajazupudem.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb51180744---16521663780.pdf
    • http://anm-av.de/uploads/files/19498102048.pdf
    • https://alhasooncorp.com/Files/files/merezepatowubo.pdf
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rivevebelaxe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+record+on+snapchat+without+holding+the+button+android
    • 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_off0000d733.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 16792 bytes
font_01_sfnt_off0000ef45.bin
a7104c17aea3742d4044957e77c81b40cacde365d724db3c4877b5a6baa8af0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF45 17012 bytes
font_02_sfnt_off00011b06.bin
10006b053fbe24e7e6ba1f5dd9b10f4529b69485dc94f560beb5f09e2dfc55e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B06 11112 bytes