Malicious PDF — malware analysis report

Static analysis result for SHA-256 52236398be7fc3c6…

MALICIOUS

PDF

62.3 KB Created: 2021-10-02 09:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8d679c77a3dac9dea24c5125dddf02f9 SHA-1: aaba365bb4cfda3b2f99445d8b1a3688664d4200 SHA-256: 52236398be7fc3c6d3a4e97555f35ab05eda98fbf68ad3e11399e0d9974bb638
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7090

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146a5e514dab---siziwazanalo.pdf In PDF document text
    • http://geomanteia.com/userfiles/files/33813228745.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/jasavazozebogizebowebuzo.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/29992986430.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/29225242475.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/wimogus.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/peranovanene.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/ludako.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/zetetuvavaboruwoki.pdfIn PDF document text
    • http://abwrva.com/uploads/files/gavivonivadukubuguzorug.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/nelijesulekotabobizuvere.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/pofezaruvetosolenen.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-5/20210905013654397120.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0335c9a7a---xebewitibuduzajegub.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/ronizexar.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/14174219583.pdfIn PDF document text
    • http://halmar.info/userfiles/file/lefibokevasiroxeloj.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613428b35476d---sedop.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/84233135163.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/18569117717.pdfIn PDF document text
    • https://artemishosp-em.tw/uploads/files/202109271713576826.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/tolowamop.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/6382608639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=15+year+amortization+with+5+year+balloonPDF 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_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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