Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4ec924fd866262…

MALICIOUS

PDF

80.7 KB Created: 2021-09-14 04:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d0786f5df1487bf2496c86d1ed7c9db1 SHA-1: 45131b5560f557be1d41783940c8087388ba7946 SHA-256: 3f4ec924fd866262ca18308997696703320e946e5274b7745cdce59ab938334a
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on disposable domains or compromised CMS upload directories. The ML classifier strongly indicates malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JS suggests an attempt to exploit browser vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=aerofly+fs+apk PDF link annotation
    • https://sushixusa.com/userfiles/files/6459691624.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/57878379147.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/80547668775.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/jibabiposabizute.pdfIn PDF document text
    • https://www.netcorp.hu/data/editorfile/7023946081.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/warefasududolujutefemalu.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-14/20210914090853301619.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/tixefiparudoruwuwefuzeda.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea1382e8af---gufowiwatifibaje.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/tquvds5d03p8q6n4gv6rbtkdn3/xodejavumupowu.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/gizemupowi.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/rekutotapegigun.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/xokam.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2ae45eeda---mosibefenexujiduvekojo.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/6876383256132d844d653b.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/togakaboku.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/63dea50f7b905a6b3c1c5b7b64ae283c/31442729992.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/waxosibibizarukezexelika.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/dugimagubazaxijari.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161391f4c5fcff---16134825990.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/70786898281.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/kurizifetanu.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/migugusimezisulabegunu.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/85536196166.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 16880 bytes
SHA-256: b2340b6d9219274da3fc3c8300c52dcfcf76ebf1efdcd27ff248f6b2a3b60e49
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 10244 bytes
SHA-256: 963a8860d2f1a5acec5e6faf8b21b79a908269af1a0b3e5c32acf5fddfea88a6
font_02_sfnt_off00011d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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