Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f945c27fdcc7c2a…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 15:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2553d1df1edca8c073b35242c7b2c4fd SHA-1: 2630e6184b82a54b0dac976663ea1ceef623417f SHA-256: 2f945c27fdcc7c2a8891292a5dfe8bb5e31ec480e489dced0df0d588fa3688d9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also hosts a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the ultimate destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=fresher+mechanical+engineering+resume+sample+pdf PDF link annotation
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/1e5c5537dc8b62e62e7f423f6fb4a8ad/gamamuluzoxisoxedu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9b142ece9---fugibipugomofemarudenaxa.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9201d1df9---60067795428.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/dotaxomapo.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/59d81db8ce8d2eaa41837c94d94a453f/pimimajeme.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/8bee8e1792aa0be74a7234b91dea208e/47707493480.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/lezofobokavovuduw.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc6d7a9b64c---xufisifupaposegamilugutod.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/gububububavodu.pdfIn PDF document text
    • http://gistys.com/userfiles/file/zevifepezaje.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/14a03107f3dd170c085d190893031d21/76921921043.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/5266246555.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d8d94c36a---sipisozexaxejejukaw.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/19792078093.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021052513445473499.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/896b21c2b58959150e551f3d21566193/14049346395.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bidemofugirel.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9gpfh8akejgdcfbavfv8u5t5p6/niwavi.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0098c8b02---modoxegakarej.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/56860206633.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612198741e6fd---49429152509.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b586155f70c9516188a7abaceb77c802/39708779269.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_off0000cebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBE 10928 bytes
SHA-256: f2a55016e6b5a2cb17366e9196d48ff584a51ddb90b0d7fd7888857905b98261
font_01_sfnt_off0000e78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78F 19072 bytes
SHA-256: 919f4ffe6d7f7d2d7931532e3ac8f449cdd4cfc8ba0e8c61719901b67200693d
font_02_sfnt_off000118cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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