Malicious PDF — malware analysis report

Static analysis result for SHA-256 459780efba1b3dc7…

MALICIOUS

PDF

76.7 KB Created: 2021-07-02 15:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 03608b1febce010bb9050da777da2e68 SHA-1: 664f9ae71d0c3e7b162e7e81798d0ba38ae57123 SHA-256: 459780efba1b3dc7c31c0273544e5fc0a78e5921f2d2d829adfde1767a4a5976
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. The presence of external URIs and link farm heuristics suggests an intent to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://pistant.ru/uplcv?utm_term=linksfield+hospital+gynaecologist PDF link annotation
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d39fdf0835---pugililerumebevomu.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/xoluwirosatuginuwa.pdfIn PDF document text
    • http://iwishop.hu/file/gasugefis.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/d74a867b9a2172e5a899a3be6bb117aa/beraf.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/99064118636.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210626135715.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/2466e5a89bacc55d7a5f2f62e93a2e8f/mojegajajurodedafuko.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/623a76031405f31ff21fc3b00e643b8c/vovimedor.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/32c0002a68dd49db0dad525386762bc2/49991415641.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da7de3527db---9218914192.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf133b9837---57405783979.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/31208744216.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9eedb84b---68445547476.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/93543809514.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/4265963140.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e29573ad9e---95659533583.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/46159630929.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b993ebd9e4d---lajopowimevowiki.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a15c0d203c6---nisukiketumodazepolaveto.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078af57ec181---pumitunanavivuvunumalu.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/33669886190.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/31b2f7847223db29ea65027aa24108d2/37345049074.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_off0000c888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 10960 bytes
SHA-256: 86794bb9dab5b441dca51746616ab803153a3754c6c4de1c808a7cdc2b60f606
font_01_sfnt_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 16704 bytes
SHA-256: 006dfde7a215c66746a4dff92382c4f62d8aeaf85db6b7a09c7fef8f8a06fe7b

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