Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f2539c691f5362…

MALICIOUS

PDF

73.4 KB Created: 2021-08-17 16:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a1135ec02b8f26469eefc2abac8c111a SHA-1: 6dee902e54267727dc5e38a6e543c887e1c8d531 SHA-256: a7f2539c691f536216792bd7e536f3795605cbb6cdfe46ed5c63f8c5222e7be6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or malware distribution attempt. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8496

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://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/18563133650.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608338d4baa04---xigomuv.pdfIn PDF document text
    • http://charontrade.hu/data/file/jesodipuri.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/nabibajuvunafufotijel.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/bi248g0j4sdkme4d3hu55d6qvc/73852883100.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/60120175396.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1e5a604c6a02b922e50b9123e2909ca3/zukawotodi.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ab64155ae83a7f13598d10f8134d42bc/53491056672.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/nodikifafunujabidupud.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/99557894593.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/k8fgfn3sc57u4tjafqe6e0cs6u/leronilanagajimotexakodar.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/nawupi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a19d3f54b57---18586598700.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df0c7536a9---zepizowijuladom.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833108ab24---nowumexakogagudara.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/2107312147085617034f8o92hvkfgd.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/b057538b5e3dbbf2341910c97d490ca8/74956855814.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607690c2baa96---77565757290.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1fuj50pv6q8fqstqkqui83inlb/77310313237.pdfIn PDF document text
    • https://masukpt2.com/contents//files/96207746119.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/78e2a28c447bc2777792797847040778/77108829622.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/37305651938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=iwalk+amour+air+duo+reviewPDF link annotation
    • 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_off0000cf4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4E 27832 bytes
SHA-256: c19c1fc5fd441b49ee397a633d7ea49b9ce7c0d0a68dd0f9fc44710fefa384b1
font_01_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1