Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b6ebe445279f0a…

MALICIOUS

PDF

96.3 KB Created: 2021-09-07 05:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c236c8d1e2806179c90cad94d68c580c SHA-1: 0f2bbc4cf360e7097bacfe0786a6b175ffe8dd52 SHA-256: 93b6ebe445279f0ae1ee210e6bec79e9edff84f4c231f51bc1bea2569947f253
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities to achieve the malicious goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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://pixomot.ru/uplcv?utm_term=dialogue+fran%C3%A7ais+familier+pdf PDF link annotation
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fe365d942df---10283342029.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/wuzikulexizipanimoligebij.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/xetogesapikulapig.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a251de6ba2afd945707d8b28a6544388/96467875061.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070323ade7d8---fonukigemumo.pdfIn PDF document text
    • https://chp-travel.ir/data/file/33778489172.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/601769505.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021062014462770554.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hi840lqeagahduih6u2sn24874/35256855591.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/45472825593.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/sudoxokitefetawakemu.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759d3e9bbd7---52313813191.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/niwiwerazoxariwinapo.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/puzurugedomuvewukafufod.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/26449127875.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/jilolututoguz.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/zolanutem.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/3845572219.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/17420726244.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/63022846490.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/3cclcpgua7sk1rsc7iorp03414/sonepefukijinarozuguwiz.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/67063828830.pdfIn PDF document text
    • 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_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 21588 bytes
SHA-256: 24d90c6835a19d1bf5a224b928eef7845cf75de80a0c742de8e1e6a791504b84
font_01_sfnt_off00013fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAC 11044 bytes
SHA-256: fc5676fd865269879b8011aab4d5161e2c604c544817022c5e0a34b35c362c7a
font_02_sfnt_off0001591d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1