Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ad752521243a0c…

MALICIOUS

PDF

92.2 KB Created: 2021-07-01 15:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8456ebdc7f6f18b3c2a0fb6626342c91 SHA-1: 6315d8a20b7827d10c135a8d7a7e3d16f15da0fb SHA-256: a4ad752521243a0c78f812c3d97996c327888e46c08f99d65caa43b0bec957d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://infrive.ru/uplcv?utm_term=average+age+aptitude+questions+and+answers PDF link annotation
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f56192b296b4a7b37739696315672129/33214121494.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090d587a1a2b---komakejidu.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/86751261634.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/64pbon6v9em1kodbfliug9mt5k/rajuwekivegotididezoji.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbe55254c---27168934945.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bnrqp9us8g79pu6h7r9joh007r/67358295730.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072852024bdf---41673403030.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/piwotezufadezetobulapoze.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607980e032679---radakirilefejuvakurani.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/lafisuvapegamig.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bb066d22a9d---poduzazakugawutot.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3lj9poh6vqo4brtb0jlrj8jaqc/zetegozamefanenadewuwaxig.pdfIn PDF document text
    • https://egf.tw/test2/images/file/wavereravelidufe.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/43617239928.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/31a99b38237a7ba350c9b65b870a088f/watunobubodizuroxu.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/17699630415.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/11324873242.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/malenuniwepoxerujezosoz.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7v3jre626c19854gfrh7n04u53/xutenuneda.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/wadixudimeko.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9f4057e140ec0aa5cad24b2a01940b54/jatudegokonalibelupeduzij.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc7ec1910---52791576909.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/fcib111qg8m700gh3rcm9ifkjt/rawazebu.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/15003234132.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B4 10900 bytes
SHA-256: 3fcf70c47fc336d66453326402da50cb654f2811ea6451bc4021891b25b2d976
font_02_sfnt_off00011fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA2 17456 bytes
SHA-256: 83a99d6d0068135d532b979e3080f49d80bea8c6ceb2d8d8d7c5517be6962d4c
font_03_sfnt_off00014d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D90 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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