Malicious PDF — malware analysis report

Static analysis result for SHA-256 7547bdc9c9bc02ca…

MALICIOUS

PDF

72.5 KB Created: 2021-09-25 14:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee512ed15301daa7a3292ab598a70223 SHA-1: 79ca15076ee006a6316da919bdec4201e66d541e SHA-256: 7547bdc9c9bc02ca2112c64ce1f5cdc5888ae428cfffa695df6d10dfae86943e
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links, many of which point to compromised websites or are part of a link farm strategy. Heuristics indicate it's a link farm on disposable hosting and potentially a phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pistant.ru/uplcv?utm_term=ejercicios+de+plc+resueltos+pdf PDF link annotation
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161323c76b6de8---50360294489.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/11141985953.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/wuxaralidonoxevusafe.pdfIn PDF document text
    • https://beautydent.hu/editor_up/jupunepurelorun.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/dagaz.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/renawasilez.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/punad.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/tuvorafemunor.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/kufogesikepiwe.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/14fa3c052e7777bc57c33d148359e2fa/61870673147.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/27acaebc1ec1f91db5a0439326ede698/bokagu.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/81055329938.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161493d79bd036.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/vawos.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161354a6538519---47329707183.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/nidufelatini.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/11259784132.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/42487438395.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/75374805148.pdfIn PDF document text
    • http://huabulaw.com/uploadpic/2021-9/file/2021092215524273499.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53367877729.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/xikebagolefonovupenesot.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/13209658121.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/16376226737.pdfIn PDF document text
    • 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_off0000b6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A7 17320 bytes
SHA-256: 09f0600c7b1d921c03672330bf550f9713804afa062c89eec8b857b1ffa149e1
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB09 10560 bytes
SHA-256: f9c7c678eb9c1159b0c310e5f44e096a772fe5c6e4c00268851e0b7217e0d2a2

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