Malicious PDF — malware analysis report

Static analysis result for SHA-256 d32a32063a065849…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 00:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 350135b434e06bf8fa90f16184eeb990 SHA-1: b512acd14b2c28bdec6118de2d3390694bbec55f SHA-256: d32a32063a06584902558f8fc35fd7668f1bc8f6a9cc5f6c94160eb842b60850
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by multiple heuristics, including a ML classifier and ClamAV, indicating malicious content. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts to trick the user into installing a fake browser extension or update. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely involving a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://carsen.sk/editor_uploads/system/files/vinuwugopilukipu.pdf In PDF document text
    • https://brs.jo/userfiles/files/90345707195.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/tipijepobojat.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/temiduvuvimisa.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/defezufafo.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/losupaj.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/2o297p24tqeg795ctivqoe5ar6/kunabutotudemupo.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/gixojikonezozeg.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147613193b16---52228768462.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/28867367919.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/zoxajazudovufowinusedavul.pdfIn PDF document text
    • https://cargobull.cz/res/file/52661648356.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/guzorapepav.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/21971266225.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613836b10f9e9---wigidinipikosadoxage.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/mujaxub.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/af5e8a976d521cacca82574fd546e70a/kebakonunofatodamazen.pdfIn PDF document text
    • http://acelybio.com/upload/files/zibutuf.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/fadosufijepepelowoxi.pdfIn PDF document text
    • http://wsm.hk/images/files/65280286870.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/93817352011.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd81a38271---xiguzonajuni.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/rifojibome.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/65571595094.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133623371e3b---8900306156.pdfIn PDF document text
    • https://soechi.net/userfiles/file/39121988213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+block+inappropriate+sites+on+androidPDF 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_off0000d974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD974 10816 bytes
SHA-256: bc6c717aec82c0e489451872efcbd9d9dbc88d97f6b20b65cb103e7df820bbfc
font_01_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 18088 bytes
SHA-256: faa611cd5b9814462bf49a9cb7705559ca443a76cc58b1ae8a32d58e160e7e2a

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