Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b299cc7a15a5714…

MALICIOUS

PDF

52.6 KB Created: 2021-09-18 13:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe9938d9a7832ec14e98a773dc08bf37 SHA-1: 6d0a457252b7d7f5d61af8125362e1e4c777a3a8 SHA-256: 4b299cc7a15a57143253756af4f6f746eaf7fc6b02a34986c7f31dcdc9aa0948
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8962

Heuristics 6

  • 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
  • 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 http://abwjefferson.com/uploads/files/79844953393.pdf In PDF document text
    • https://dom4m.de/userfiles/files/duvodikodov.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e121cd4ddb---48109010525.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/ninapojepe.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/kodilage.pdfIn PDF document text
    • https://kawanmto.org/contents/files/44275250178.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/kowuzoxezedosom.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5lhkv0kc3h3c34158mll5oumeq/lirugenututo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/26491134809.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16145622e4e180---xanojojulusumepipimoveb.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b51b92022---zonajixu.pdfIn PDF document text
    • https://lesura.net/userfiles/file/wakoresufedodoxenedamodo.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/tevukek.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/29900248609.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/sububolabow.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/zejawovawig.pdfIn PDF document text
    • https://kuepancong.com/contents/files/13256638799.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/59872004236.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/14042202898.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/bajusanosuzoxukesewu.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/bipebafanufoj.pdfIn PDF document text
    • http://mega.kz/media/upload/files/51084238365.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/nipowivasepasafufiv.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/gagufakewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=find+ad+blocker+in+chromePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD5 10580 bytes
SHA-256: 45afb1790927daf5c64f555526ff3e62dfd83940ee59e389b7c163adb9c4624d

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