Malicious PDF — malware analysis report

Static analysis result for SHA-256 c889f1513617c53f…

MALICIOUS

PDF

74.8 KB Created: 2021-07-17 04:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 08ee4fb00af233bec64dd115ee74ff0f SHA-1: 7a7f1c49af752044c4b02b454259c385760e7d1e SHA-256: c889f1513617c53f83a140371b73aae23f5487bf10a708ff55c3e66e07897613
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7960

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://kiuanai.com/userfiles/file/gubijumetu.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a094bd3c7d0---37891056386.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb82e70737---wonek.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fd6ac916f---32344654670.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/24029234951.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/d1626ab1a94d967ecbc80ab8edfd8ad6/80530641994.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/183e89be878f9ad9df25b25c6ff97d99/xopipekivefusepagop.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/rewexidixanuzafivulud.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ad17d7d4b---betagorubokevibasu.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/21318773939.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/1383eaf159325273bf63015af6fbe36a/73339760530.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00111b262---44475452048.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/16157105326.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/30837745310.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/lelimenenamis.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/jamafafilemuxebebe.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/12b96bdbdf0de4a0c2ec7e2e88090b00/jodujetedoligipukiwome.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eefbca03bd---8984542972.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/55258182516.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/h6p5n88p3ucro4h06cgp0pfe39/52054848371.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/574ad666d0cbc298646a58968266d4fd/fobapezolitulerulik.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/16359865013.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/lerekajibabanekuresoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=circular+motion+problems+and+solutionsPDF 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_off0000e61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 17820 bytes
SHA-256: ab18eacdb067a91ef4338317aee1cc75518a6037e50f646ad462f0471aeb8d5a