Malicious PDF — malware analysis report

Static analysis result for SHA-256 de63838715885d03…

MALICIOUS

PDF

81.2 KB Created: 2021-04-30 04:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af145bcd4aff836351670e5512947a3d SHA-1: b736a46a5cc9e37748284325670ddffca06cc1c7 SHA-256: de63838715885d03c2971d8d7bee9cbc34c783affaeb1f5658d7a46e6a5a29e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The document body appears to be obfuscated or corrupted, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/e8647902405cf856c5842cd255ecd747/sejomazotefufituzix.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/55375c39b7433e56b66bafefc9b4b3dc/37974662625.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a4e0e2873---xureriro.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/r5rvor9amveklr2na6omjaiurs/75349695234.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719d8070cef---jatexebojubigas.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fcc08c224---91316148641.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828fa8923e4---tuveriwemejuwufuvetagu.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4pls66u48vlcsa85vg25ed1dl5/jigazatoridupup.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fca8e538d5---kirugujonulu.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/834a222d5c9459a15e9db046983c9d0f/14583892002.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fd224e6ad---gixube.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a963e17667---53923992071.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ju364e7j5uutsu8ekeec5aaaf1/jiwejagemekumiworudusupaz.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff11521c4---moxomozulakogamixiro.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085f10e3be83---vesinisenoluxepoj.pdf
    • https://aartipalette.com/userfiles/file/vorexunurogelefenu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gloomhaven+brute+guide+imgur
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdad.bin
d8f31b250443ce1e19492a0456f5f5cccdc99700d872bda06ad3be510f6c9256		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 5292 bytes
font_01_sfnt_off00010f7f.bin
1fd610687e99660c55ed514aef3fb1036aa779c20784304d76e599ae34a7e9d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7F 12468 bytes

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