Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d120e8143b82ac…

MALICIOUS

PDF

478.6 KB Created: 2021-05-19 18:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4fa0d8f8b746051742813827b511d802 SHA-1: ccb0d062f81b1708777256f513c4a3daa312b8cb SHA-256: b4d120e8143b82acda1e1ead8c74593f1005e5f42350324b3e16bf0e3e872b10
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress upload directories, suggesting it's used to host or distribute malicious content. The presence of embedded URLs and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9581

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://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/m97jna8mek6kjemq86j8kjlql2/tedaritezetu.pdf In PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/e9eergeo05grt6ae3s9fsmnrsm/sewikubiribejewogus.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160908bf26dcb6---nirepexuzivisik.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/0513305124.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/bejebusakapevapavekarud.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160713f0761b03---57435153120.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/bajivuvo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083f988762c5---60304213044.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/1882ce8403f2dcc837c6c2d89a7e4e48/tenepalatu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/82fc2c8da4587986c2cfffb5188f5c37/melosozojumizigabozuw.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873f8af2d05---70229524134.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/phf6f7ck1ukdi0jj84vkvaorcj/fibumore.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071e84c4dfa7---wutilojiziwoxoxave.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/PmAiG5ZyT-k/uplcv?utm_term=covino+and+jolliffe+what+is+rhetoricPDF 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00072caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72CAF 5244 bytes
SHA-256: 4d9e8ed0f36af48e5124299bfc14d01787ab2fd7fb049177371327b5724148ab
font_01_sfnt_off00073e97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73E97 16008 bytes
SHA-256: 3e45a000734213ff2c2f633bb20a62f647d2a04cd4ee0144efdf17034a11f592

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