Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eb17cc5d700e43…

MALICIOUS

PDF

62.9 KB Created: 2021-10-11 00:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0e66bc6848b8e7f0912736d8e098a0d3 SHA-1: 33718a11b82a780d640ece7f7c8d1b0ccd819b12 SHA-256: f5eb17cc5d700e43ddca90e031ddbbc6b1f965556d7b5cf71edf025485a427e3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8517

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://cructi.ru/uplcv?utm_term=are+union+dues+pre+tax+deductions PDF link annotation
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f4e3f11fae---rosupegag.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/32111001006.pdfIn PDF document text
    • http://safarang.com/basefile/files/91294864124.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/23a221475fcc8883fb2a4801b8dafbf4/jewusine.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/99702865014.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/19839496416.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/64933199241.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/24259508514.pdfIn PDF document text
    • https://jeevadhara.org/work/london/userfiles/file/jozemusinuvurulo.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/pogukugolegoxikovuku.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/16342775432.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/jupajawamefajaku.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/24156578581.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/mesuzadirisuxulonelode.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7502a5e5---61542799568.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7b7a43dab---12617527820.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/49359543245.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/deduniriwenan.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/xunuzoxowutusalajol.pdfIn PDF document text
    • https://avflash.nl/upload/files/rilaxajadoxe.pdfIn PDF document text
    • http://hkwwta.org/userfiles/20582402230.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/da761c664bd71bdf8b8bbb17e316d5b2/7122033628.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/kakep.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/ip9hplp0utfets6sla2lc5nsge/49628943184.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/sizeg.pdfIn PDF document text
    • 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_off0000bc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC84 16024 bytes
SHA-256: 3808257c33407765c0e35b466074629ca553f178322e6fb04eafd1a34200f514
font_01_sfnt_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1