Malicious PDF — malware analysis report

Static analysis result for SHA-256 604747f0df478cfc…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 00:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b994fe3af7ed3ea5f73b39288524a2f0 SHA-1: c7938a85fe86c751776fcb5280231c49d60fed74 SHA-256: 604747f0df478cfc6f57e08019ee1a9cadd9bbc51555e4ccde372199f238cbea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead the user to malicious content, likely for phishing or further malware delivery.

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 http://efuturesthai.com/uploads/files/rexolana.pdf In PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/narakewimuxote.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/47384098366.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/tofemexarawegimavimox.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b513e64864---78215490044.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210909152056.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/lokigorosopusapep.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/19064854718.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3022a271e---lolepufuge.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428a57e4e27---11940024147.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/76118880295.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/fapolu.pdfIn PDF document text
    • http://bamila.vn/luutru/files/16872852179.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/zozakeni.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/19085389858.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/17505185576.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/vosusunimewovuvogug.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/rutapisituzuvanowo.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/dagapoluwules.pdfIn PDF document text
    • https://adikkedua.com/contents/files/lufupunogubekukojisutim.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/49537369695.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/paresuzuzidobunukek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9db6bda74---kiwazizepemijadagejiwo.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/24771833619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=motorola+droid+x2+reviewsPDF 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_off0000b136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB136 16136 bytes
SHA-256: 5b807faa5e667321938745aca7c4e93222cb4006d65c5abdc7b054ef3bddbb98
font_01_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 10504 bytes
SHA-256: e546b3c5dcc13815fdf2959fd266ba51388ca6d5b44291750b5492cdf46c9f10

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