Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ddbc923cd26aaba…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 03:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d2ad93650f19fe3ec43c914327547589 SHA-1: f3a5d884baccbf392f0471ea85ecfd4043a5cf2c SHA-256: 9ddbc923cd26aaba369ff46b5aaf7a8739e321100617d99bc5cd9a8993942556
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and other domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that this document is designed to host a large number of links, likely for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/6024749523.pdf In PDF document text
    • https://iphastkala.com/userfiles/file/jufedonimujatuxoxu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/8a2edcd43f16b2af9f646e423bbef9b1/pafarijazanigumidozamijeg.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/65304943814.pdfIn PDF document text
    • https://actorconseil.com/files/file/wepopigabixufakodevef.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e71a30493a72aeb6ffcb5ebc7f20f7d7/lajanoxetiluwifuvilepi.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/kevuxunedane.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16073b41de47e6---37221290502.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/rrb6i7tm4it06qn6npu26j44b5/jupinufil.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/madorupexamuso.pdfIn PDF document text
    • http://boxethai38.com/upload/file/veveva.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/pesibowekenisasumixozijax.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/29704838527.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/kedobofutotuxax.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1610d38a06239f---wevivivavaz.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c27af67746b---65187386235.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/78081480056.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a26ec22e2c---fojamebur.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e1401bde4e2fe384c83ad5ca9011d09f/56243067632.pdfIn PDF document text
    • https://shidoremicrosys.com/media/63191736193.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609445c15a68a---worerokig.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e3ed1f9d4---jewanewexevadazesokanon.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/widonurexolofalaminu.pdfIn PDF document text
    • https://iaetindia.com/ckfinder/userfiles/files/tozegotilaripovimanakefat.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076e0bb9e9cb---63949661569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=learn+autocad+free+online+pdfPDF 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_off0000dbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 17344 bytes
SHA-256: c4cdfc6bd24f8f4bf7fa6e62448a4bb22c52a6db87ff54ad1fb5a243bb8a2ae4
font_02_sfnt_off00012096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12096 10504 bytes
SHA-256: 5d9848533557786c82c947c772e8729b4e925bb046673e4000abf01c71d60c10

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