Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6820d9c57fdc98…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 01:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec70310d17beb6bea984af480a587d00 SHA-1: c5c8fa768783876fde5b0a02b8baf4f2e6c5a23c SHA-256: 5d6820d9c57fdc982bb31ae3be180dc902c923efe21233cdc8416174e9fdabec
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a likely attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26c22c5758---93768121037.pdf In PDF document text
    • https://perfecthospital.net/FCKeditor/file/dixegafupizufasi.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d3c9b3b18399238cb3163381d366fb15/75475149735.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0544b9114---91633851289.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/14924541625.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/gotazofurizijinakasij.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/41453074846.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/varenuvosexozotela.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/xudejapejolapadak.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/2238771497.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcdcf195dc---fopudiganobamikesa.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/rejikuved.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/2nbsh61j8g9e43kabd0q515pl1/94558566136.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/51e372b0ab63573f60827233eb8d1a43/88152834625.pdfIn PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/gawugenimalogawaw.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/cf92d3dlfd101o5uamodr7jjo7/88751970386.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/widobojuxilofikojune.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/fowolikimebanulabud.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/7613811584.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16079539eb4abb---14924654368.pdfIn PDF document text
    • http://eta-aus.org/userfiles/file/20210815090606.pdfIn PDF document text
    • http://machulski.com/public/file/lovinosizejesagok.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607284513520b---fipoxazuzimavujajeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=severance+ling+ma+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_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 10720 bytes
SHA-256: 3c1c47a6712f8c05b0caadb3d69da29be8943b5ca4da2f2b00d86122e61344b3
font_01_sfnt_off0000f806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 17212 bytes
SHA-256: 6340e5a6ea741f79ab415f3f75aef91929638bf0f18233be4c62289cc6854c10
font_02_sfnt_off0001250b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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