Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5d5b6c72ad161c…

MALICIOUS

PDF

71.7 KB Created: 2021-09-14 07:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1acdebd52eb5c363808c4cd7b0f82c4a SHA-1: 46d5bf375148a61af4bf760675b7140d24827ba6 SHA-256: db5d5b6c72ad161ce625e2b04061cee61810515df4173798e9af6d8bc5bb89f5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on various domains, some of which are identified as compromised WordPress uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript (T1059.007) and the nature of the links suggest an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

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://tuvantindat.com/uploads/2021-09-05/images/files/71080289426.pdf In PDF document text
    • http://showdoimovel.com/files/files/72868086387.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/37676978920.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0bd9024a---xidusan.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/91079410114.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/wazefunotanifuledoz.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/poguto.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906003547.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/43861599884.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210904_F251C8FCFB06B9BD.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/6069929796.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/50847452331.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/96189086259.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/gureka.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff95f79506---lusezaniga.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/kurujafo.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/xabesozikixivok.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/40559254120.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/41694088182.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/nozetamumirupinobunu.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2b6f7402008d50a4ebf948916891e128/5478137693.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/gitaj.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/vavosazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=best+android+launcher+apkPDF 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_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 17748 bytes
SHA-256: 59111a5c24b7a9e3157c7c5a257809e9d517e8697d5c2b4b61561b7c50ee3889

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