Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d5353c7910fc11…

MALICIOUS

PDF

56.8 KB Created: 2021-09-12 21:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 83251426c86a8641280393d0f62ad809 SHA-1: 4405c8599a977eec6c9f415c68d7ea4df07d3d4b SHA-256: b4d5353c7910fc117f0dc5a648a4e1a9560fdc1f24abd629db41d140f3664fb2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm hosted on multiple disposable domains, a common technique for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links to potentially compromised or disposable hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8244

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.
  • 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.
  • 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://allivecoat.com/userData/board/file/tenusunubakijajiso.pdf In PDF document text
    • http://rescue119.org/userfiles/file/48758915091.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/gudibixobetiwukikasa.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/95927152826.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/ximokomamuxaw.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/nixomagofe.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132de399d0dd---rokasixezapalukogopusen.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/wejobebiwexekugijo.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/tuxirofar.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/gavomunelefuvura.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300aa56aebe---50433006189.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff67c18a90---fudidadiwemoker.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210903/file/16306821598024.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210911_D9CBA01AB1167716.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/12146791982.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/85486716777.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/mb2gi4jrttm2jvm3fhni5ie4r7/97948066262.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/zuwur.pdfIn PDF document text
    • http://beta-rc.com/upload/files/92879150529.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/buwomis.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210912085831.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/31937359747.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/90965473077.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/30657571899.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210904075153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=excel+funkcije+pdfPDF 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_off0000bf8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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