Malicious PDF — malware analysis report

Static analysis result for SHA-256 749b0ec8ef1c2869…

MALICIOUS

PDF

107.6 KB Created: 2021-07-04 05:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 95618492a6c903b218e8635a1223c12a SHA-1: 258d05c286fe3240df3b09a790c6892f46204c7d SHA-256: 749b0ec8ef1c2869fa82ad2fb803a9dbc6541a9ef36d9aeae32efe007c1619aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a malicious PDF detected by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The PDF's structure and embedded content indicate it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://irlanc.ru/uplcv?utm_term=pdf+of+the+constitution PDF link annotation
    • https://kildevangen.dk/files/90738147861.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a00a3987---36023080479.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a39b0004be4---nupenezedumokavajapiru.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/48562046361.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06b586520---pavinariluza.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607943cbc7d1a---54556713934.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/49ejpns095n8gon9o5pk7u61gh/13264272747.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/6543025213.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a237782bfb4---xexesoje.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/89111561440.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/zebotuxudemigox.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d788e61f---63453945448.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3069f52d46---47281657291.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/43547349201.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c661fca177---44349005941.pdfIn PDF document text
    • https://unosms.us/userfiles/file/58481284719.pdfIn PDF document text
    • http://unsersohn.ch/images/file/17308792505.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d32db44587e---xiwavezutaduw.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/es2jnpqdm8fam2ctcgmum9tdkg/26314765116.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b0add607e20.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/4lro5qdm7isf62ruetks6jtt03/buwitudukixijegosid.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/84574046231.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a0d4385b852d821a7ad9f010ec0c764/zaliwixokenifomijoku.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_off00014432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14432 10368 bytes
SHA-256: 8c635d9d72aa2d63fb541ee6f4a35294e0fdda95740c398a2f346ac33249f722
font_01_sfnt_off00015b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000173a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173A5 16888 bytes
SHA-256: a81b896a5ad53107199535ff3b3f736376a630b8fcb0fa692179d57b46155076

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