Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72b3153af44a010…

MALICIOUS

PDF

288.0 KB Created: 2021-08-02 00:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 149e73105280d8b99090b61c9e378f28 SHA-1: b9d5a868bb8859f8823aa2aa52b7517223bd18de SHA-256: e72b3153af44a0102fdafa2fecf1b41821decad32f06260b3e79f68d43971112
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, indicating an attempt to host malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7522

Heuristics 5

  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=free+movie+wav+files+sound+effects PDF link annotation
    • https://edu-mate.kr/_UploadFile/Images/file/15873328810.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/sadapagerujegusujewatun.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/512b46133a5ee51a56549a96e3b45ff8/rilaraditujodon.pdfIn PDF document text
    • https://blogsma.com/files/rokagogiregiminadedavup.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/65b151663ca761a46dbd7f068a65b8ea/pazomediwokivatugepuroru.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/tozajokox.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160890c1668c54---87889115596.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/35829716129.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16106b80358343---85090757854.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/18450d036fc6c9886fb3fef9ec8964b1/64424138324.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/pebuzexobujo.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210714031714_j1hwce.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/72bd376b97cd3faa348dc76f0b9a31ff/dezeworugomezes.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k4ifnhbp3nucnmhg1fal54sv6r/dofutofowipituvojuweviwa.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/wibowojewuvokugi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b549f3edccac2cef648f9aac9d48bbdd/kenobarafexafizafunat.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/wulaxikirajegudadiga.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/limukikirosuxanewawobu.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/xijizitosanofezoposevuxor.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/20601811858.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da347e1fe48---dodapifesonamoletodumifim.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/wogofilewuzadew.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/5f3b7f87f02d271f2d6db0079ae7cf14/satuditupupomowa.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000421d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x421D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000439e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x439E8 21108 bytes
SHA-256: 980661bbcb0433bc21df75f8dd249477cca9be561aa6357ebb74ff898803c637

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