Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc91d929cb285e55…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 17:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27d267979c76ec4bfb633d2430381340 SHA-1: 9a4de4a4ebccd9932c4d301c1525bc7e1b8e3b9a SHA-256: cc91d929cb285e5501fd489d71afe5ad2c9b0d7c3535d27f665bd9312b439ba8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features numerous links to compromised websites, including WordPress upload directories, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://talleresimad.com/images/subidas/files/lusud.pdf In PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/2e9712cef07aebac0fbf5b955ab3e7c4/83442279987.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/45640085130.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/farezifuximulubewonu.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/nivepunurap.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/63558895317.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/46581868318.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847eb164d16---24656958204.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/771c7b987cd0f1d92ae731541a750de9/69443075256.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/040014362728.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/vutuburarumogibexe.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/8146648980.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/regepa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00e8f0929---84017820801.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/topepudi.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/97949391877.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f0e0a3a09585244db07ea31f2905bfc0/29777805098.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/wirivewo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7cedb36ef96d4c31e357b9ff9f7e55cf/nojelavidiw.pdfIn PDF document text
    • https://telorgabus.com/contents//files/nasugoxabasoxut.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611da31ce1e88---zewaradezizitaw.pdfIn PDF document text
    • https://bauarch.bg/files/5560149765.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/99059397880.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/thhc41r9c1vlqh49m3ul8lt49h/bebabirilugaruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+to+word+doc+on+macPDF 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_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 10284 bytes
SHA-256: 938fad98d2a8be1ca31177290318d32484020609a7db76da559241260a07d6d6
font_02_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 16924 bytes
SHA-256: 689838b782adc2780978651431e1c54051c4fc3c66c3bfed7fbe21aa0205bf50