Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d2b35acbaa71563…

MALICIOUS

PDF

72.4 KB Created: 2021-09-01 13:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b2c81337a83fc91ff6d07f5e4b54f9c3 SHA-1: 29f5b91ab9b22f2dae14de610511de1ab25c2a0e SHA-256: 6d2b35acbaa715633ea138ab976f8fcc27caf8bdcbe846c26341c0950120d004
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate effort to create a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/588be8eb9ce159085fffd67dbd83d29e/mumopinugubixolunivabo.pdf In PDF document text
    • https://parisnordmedical.fr/docs/file/97522036433.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/zaxawo.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/wowarojawi.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/nagiu8kco7a6tp2c0mvuje6mr6/70814608735.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d57d1986e---81952303580.pdfIn PDF document text
    • http://altus.pl/userfiles/file/95572292853.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210706_204848.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608689ae0bacc---47349955363.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/metexujigobikaboranofuja.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/519501118.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/14572695228.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/defozidogorugebasa.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/12cb0022ee02127a4e88ab45eaf73538/27244191105.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/fifoxafejebobufu.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/30262184636.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qka2l1o12q3u44ai614helopm3/viwejasajuzedeb.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/ef7226191c02015daf91921d91dcb633/zukejumokater.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/pajosajivevebadumijevito.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/27666475547.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/jenisepidu.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/lejufobivagisudirekoxa.pdfIn PDF document text
    • http://dejede.com/userfiles/file/83448841142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=princess+and+the+frog+book+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_off0000b880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB880 11084 bytes
SHA-256: 11234f13db5d8070db78b1bee7cd3a2df9ce564dd1343703111af61c3b47fd8a
font_01_sfnt_off0000d1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DB 16400 bytes
SHA-256: 6a1843be875fb35c0f4b3eacd2b40ee38d1f44b9e9acbcbf182c239e9fa9f75c
font_02_sfnt_off0000fc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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