Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4c980b2efd8475…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 08:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fdac76a353d1a03c82bf5d5b108ca2e5 SHA-1: ac16d1822fba0274de52795452622fb682cf5bbf SHA-256: 9f4c980b2efd847598ac052699c0b996a6de8c43ac2915e1738997af9f2af00f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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
  • 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://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137373834923---rosinomanebavugute.pdf In PDF document text
    • http://newshop.jp/archive/file/xesobize.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/2439542258.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/zudixofasenagaxolax.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/37386032791.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/11097094242.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/40592277198.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613499ee4b67e---6656059777.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/45562019062.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/98523374171.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/14275952981.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/12933665546.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/8515892291.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/14385683901.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/92720339316.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/89281535137.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/xedijuwujuleduzexo.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gisewixomixer.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/78364658691.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/88648163212.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/06d69b2d3c1c386890716b87644dceb6/87041939764.pdfIn PDF document text
    • https://apra.pl/files/file/42562175956.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c996f24884aad39918111cf7dc74f211/zajebekawe.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/gakarobige.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/lomasafipalomidubikulen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a353b7a00---pafobowoluvekakebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=what+2+colors+make+orange+paintPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 17336 bytes
SHA-256: 463f8dc6fc53c36662c4a3c6962b6e934a12e8693ee828647237d6755c3cdd55
font_02_sfnt_off000123b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B0 11024 bytes
SHA-256: be165df2367050be543081c6589cab4a87adf3e1a646d61ba55bf9f6c7134fe7