Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedcf891a5ef95e5…

MALICIOUS

PDF

112.0 KB Created: 2021-08-10 06:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5915b979a0d0aca4b5ac3017855fcf5c SHA-1: dd4878f663da07c57390801f93c22ce6cf3d8b2e SHA-256: cedcf891a5ef95e5880521c6b2361a930b1db260c066f9978be1ba9cac3769a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these redirect links. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tochuchoinghi.org/files/bezinaxesevubotuzizadedus.pdf In PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/224fa93b1ed2675a2626af5773029bae/fabotipisojepabonapen.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6b44d39597e4bb88c20a96765c54f05a/dodez.pdfIn PDF document text
    • http://gysanya.com/upload/file/210803074932525598ibitnhra99lb.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/21944780290.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/dirudilinizogu.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/kimokorijip.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ilp7te31pm2cud0at5bb87hvfs/furero.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a4b0f407c19b4fdf74369338ee91d4ff/pidafirifomizirolabapu.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e7334b817cf2981f7465fe5616a152b5/39732486753.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cea947ababb3f1ae1063e91fbbbeb70d/72695948561.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/05b49511fcfa9bced68609e45908583d/gukizapuxu.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/gofenifilexojugal.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/8815605787.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/69272186895.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/lapagebe.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/97b812e67124867570df9711ed2c1e78/25621658093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+the+theme+of+extremely+loud+and+incredibly+closePDF 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_off00014db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB5 11188 bytes
SHA-256: 174c1fe48d0f8f293b615182be1017cc5ba407ad338eab58d1cc54c653a8d781
font_01_sfnt_off000167c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167C1 18220 bytes
SHA-256: 0d8de1eeaa4d9dd0922ae7a6a1468e569e1ba29aa0aac0e2e7f56d117bb2b5be
font_02_sfnt_off000197b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x197B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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