Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18364a58f5cde7a…

MALICIOUS

PDF

61.5 KB Created: 2021-09-08 11:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a6b5e64bf0b5f8df5d537587a77f78d SHA-1: 7adaf94d3112664c0a1f8b9726d907edf7cd0b7c SHA-256: e18364a58f5cde7ab9d268c9a7f19d24177fc53f57e5fbc050172d11f82ae820
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and multiple URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially to download further payloads or steal user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7898

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 https://queure.ru/uplcv?utm_term=commonly+misspelled+words+7th+grade+pdf PDF link annotation
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3b23135cc80e193b13064c0a835c21af/kimibufup.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/vutuferenuguzu.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/timabalimagewinefetedukif.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/ca80dbc9af1155977f7391d6cf589ee9/20460300791.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/8244977498.pdfIn PDF document text
    • https://tdsns.ru/userfiles/file/31774970655.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/aec5fdde5f852eae90089d7461eab72c/vovufetifede.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/02b67b07ab47568490099a4ca549fd71/rarujunowukivo.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/0d3bbd222b845870524e109a892df2ba/52314699446.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/saziwopemaw.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/wifuwizamikivasamababowag.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b29df58251---texeketowikobinaw.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4a4d9152d54f2c7fc7501b0e40a5bc0e/futimejubituruv.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/a1fbe5b3c1a50b289bcc1e2a841b3ec0/pumarovivalupozeke.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/dewezi.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/34924397102.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/62070397610.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1e5dcc7d---14656690117.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/zipavosatulogemixalajuv.pdfIn PDF document text
    • http://checopharma.com/upload/files/82720336165.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/vadisajepetoxokifak.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/16271371738.pdfIn PDF document text
    • 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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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