Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff8437ac9489308…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 11:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0556f9609cdc81bc6bc1cd4aaa135eca SHA-1: c15469f63230e78041dec4be2b00b878d0cb5f11 SHA-256: 7ff8437ac9489308a46d8eb121635e9fcc56043928f3866b26007a8229eca501
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nurea.se/currency/userfiles/file/lolixavexededifowovi.pdf In PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/tiparewidonunotinov.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/mibodutapopobaxerenid.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/jamowamanubifilosed.pdfIn PDF document text
    • http://zeci.nl/im/image/fuwinumunitisirejasowexu.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/nipabuzipubebonenanefebo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad63feb79e---xawunu.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/bipixatenimadozavedeb.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/jobobokinegizugo.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/67467893431.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/43710973104.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/18566801007.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/80935840549.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/44773640389.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/lexigunutepop.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/dinisuxabakelidozobumoguj.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/lexutolade.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/36173127977.pdfIn PDF document text
    • http://foxadv.net/file/96566057281.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/368fbf3bf80fbf10834083d2d276f404/naromasokatuki.pdfIn PDF document text
    • http://xingzhongjing.com/userfiles/file/20210914165315_1363054817.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/bafepelezeta.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/zotimogofawomije.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/pitux.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/78013285266.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u77rkifjp55sj0prsqio7tg7d1/5702428049.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cd9be90bb---zenebatadupisazenegoguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=legend+of+zelda+breath+of+the+wild+for+androidPDF link annotation
    • 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_off0000b3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FD 10708 bytes
SHA-256: 29d3abc0202168d70054dd2864d19f37216d53607d6108d5f131333e4a707f94
font_01_sfnt_off0000cc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC53 15336 bytes
SHA-256: 69c4e29efc6cc075058d0c3d1a6d66fabd5a1dfa73af22a6cff5cd5e8e5c6247
font_02_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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