Malicious PDF — malware analysis report

Static analysis result for SHA-256 963dc4fe81f2d58f…

MALICIOUS

PDF

97.5 KB Created: 2021-06-18 03:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 64214399892a511ea3d37dfccd321e5b SHA-1: e30a58f7b192b79d219a3fc58e2d52f76a874dcf SHA-256: 963dc4fe81f2d58f4cc75ea2fd8f3200b5f22a8e58259d48fb89b7368b8f070c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads, suggesting it's part of a link farm or phishing campaign. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://prana.video/wp-content/plugins/super-forms/uploads/php/files/ohdhobgj79hceam5fuiv89gkiq/lezujejig.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b8fb07757f8e82c8c30c5ad11e80bb10/doduzom.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac1ed1ec212---22878913570.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/torowemogakis.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2805875c9de1db084d6ac17e80d58231/2091202819.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/95225157875.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/3m6elt2o5rt23sng0uarklasa4/53593215236.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/tbebhda0pgm7f7hcp210kf4i66/fapudiwilo.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/sanos.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/3565506253.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/gjf1h06mlkafqs5to93vo81qtv/digakufukebifunajuwa.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/bdgo7ae0d0h2g5dogm810acg9c/taxemofo.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/63922471666.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985a8cd0a43---17848953946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=play+pokemon+x+and+y+on+iphonePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FD 8176 bytes
SHA-256: 027d9e794375335e0e8111c2031932b6bc3521ae0164291c8338d525d916553b
font_01_sfnt_off00013cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD2 5160 bytes
SHA-256: 078ea17498d2411ccecc53f5bd5952acb99b2df17e7033944c5556f7eff43c0d
font_02_sfnt_off00014e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E47 11896 bytes
SHA-256: e189dfb1411fecee9a4945e305dd2d05c74d3b1df523646b9c4f4f94cabfc031