Malicious PDF — malware analysis report

Static analysis result for SHA-256 cddbf4866d9a2e64…

MALICIOUS

PDF

94.5 KB Created: 2021-07-07 06:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 724a694d47d351676c6c953bff8d71d7 SHA-1: 8168227cc1fd7c3c8f3b998d4b7b4f2bc512c6cb SHA-256: cddbf4866d9a2e64a6f1bb2217addee7c66be58cb4e28efae0366ff3b8aec28e
164 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of a 'download button' heuristic reinforces the lure-based attack pattern. No scripts were extracted, limiting the analysis of specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/e848036c3dd0942d994f569349f503be/ratupuxejonugojegu.pdf
    • http://3qbuy.com/CKEdit/upload/files/50573013594.pdf
    • https://zoorichi.com/temp/fckeditor/file/porasigebumifomoz.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/cln72d2jmlrs46m5fpdi1d45kl/98336343644.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc7517d6f3---godudawanezudogumis.pdf
    • https://rocksoliddesigns.biz/userfiles/file/sejogotegevexumofatoze.pdf
    • https://monographie.com/ckfinder/userfiles/files/97251276228.pdf
    • http://bioident.pl/photos_fck/file/sewevulirebubukuxepopuxu.pdf
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/jozijelajikogijikupi.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/981c6ea0ec66ea5bd2950290fe61139a/11420895900.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be32e03d63---nadar.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb1144ef24---7824279838.pdf
    • http://pr-jam.com/ckfinder/userfiles/files/72495041641.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9a15c1ff1---9050935934.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/954a45058eb17f311d3584427e41af46/robedabepirafuninofukudi.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/82458235404.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/36589738509.pdf
    • https://xn--nmqu14inmf.com/upload/files/merejoper.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6s56bbsjov8m9n2dobrg6uknuj/74713500778.pdf
    • http://www.herbertvanderbrugghen.nl/draft/85646833080.pdf
    • http://greenhousehotel.vn/uploads/image/files/wusujo.pdf
    • https://a2designbg.com/userfiles/file/9845379638.pdf
    • https://kolbandibileklik.com/resimler/files/98621882747.pdf
    • http://healthywithhart.com/res/file/limegabisiwosul.pdf
    • https://quatden.vn/webroot/img/files/30888193886.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d8efeef9e370bdc8e1906927cb9bf56f/72720910212.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0f68f738cf53a4ca90789909c90d9723/zupidesofedun.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=woman+delivery+operation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f97.bin
1f1221586ae87d82e1f0e89b66a1462139405ff2ad5559277b58c7efffe49cb1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F97 10560 bytes
font_01_sfnt_off0001279c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1279C 16792 bytes
font_02_sfnt_off00013fae.bin
d5a5a17eaa25715eb43df32c73534c880c488bbfc1765d3c4f2ccf2f35eeb420
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAE 17124 bytes