Malicious PDF — malware analysis report

Static analysis result for SHA-256 feffcdfc88c3ed86…

MALICIOUS

PDF

86.3 KB Created: 2021-06-27 13:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffdf1caf86b535414a3f2f4351301f63 SHA-1: 737b269b5c53482c9207159e13c4d5639d2c1686 SHA-256: feffcdfc88c3ed8617da7dcfb1d06da957cd41a39fcee814218294b2cb4ebf84
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/004uvgim858n47vsl816l7f7sr/81410379361.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0f4126092b1f396bc90f10a75d3509f4/56279007380.pdf
    • https://lesfeesdelhetre.fr/upload/files/50929860719.pdf
    • https://aduanaldelvalle.com/userfiles/file/bolitupaduja.pdf
    • http://arohitourandtravels.com/userfiles/file/74660937868.pdf
    • https://harkakotony.hu/UserFiles/file/79633796483.pdf
    • https://ahreco.com/uploads/news_file/tiwopowabigopume.pdf
    • http://alexlunacoach.com/img/editor/file/98219546823.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907c4195ddc---80989804698.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/b7af89964c3acbc245b97751bd54e4d0/panedipi.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/9f08f155e6f7b2137ced75791a70ed24/15476238574.pdf
    • http://gourmethousemacau.com/UploadFilesfile///37679409356.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/896a4b5594d9322d08167e492f8eaf2e/tixujorepabego.pdf
    • https://edcasys.com/ci/userfiles/files/tivabuxuvosavezilabew.pdf
    • http://hzjksj.com/images/upload/File/29078407144.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbce4e49fb---57308377115.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210521203309.pdf
    • http://cathugo.de/res/wysiwyg/file/67084314399.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1473af553---30511096026.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/74573a947edde445d69ebcb6d2eaf016/74613368709.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607649aca82c6---18015219486.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757a634bb8d---75122739944.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+cite+a+whole+paragraph+in+apa
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE70 16792 bytes
font_01_sfnt_off00010682.bin
f26edd5bc2d6af8e572bbe89ebb454e0573dae15573c6f4b3d017e35ec78705e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 17380 bytes
font_02_sfnt_off0001340a.bin
21e9c0d47c159971faff0353c6c955d6f0f691a0c30ba5569d9ef293d0f86980
pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 10564 bytes