Malicious PDF — malware analysis report

Static analysis result for SHA-256 6824a9b06f4778b5…

MALICIOUS

PDF

85.7 KB Created: 2021-07-15 22:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f55785003e629a3f0d6114d703677436 SHA-1: 74a9fb57f87be08d4abd6b7a9fdff7a1f6a96193 SHA-256: 6824a9b06f4778b57741ca7e4ef5e4298bedc1a00fb2c3a0d1acad38f6cab50c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary function appears to be redirecting users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086ab5a64bf7---95052597585.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbaf8431b---63227449453.pdf
    • http://ibb-online.ru/f/file/29254414064.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b4701459cae---ruxulapipetibaxipoxaroma.pdf
    • https://euroroma-bg.org/files/file/bixigis.pdf
    • http://condosworld.com/abisol1/userfiles/files/derobimijiwugojo.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/25198987763.pdf
    • https://cissud.com/uploads/ck_editor/files/buleledawinarini.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608940b5892e3---18892179981.pdf
    • http://architettoletiziamasciotta.eu/userfiles/files/sakadex.pdf
    • https://reparationmobile.net/userfiles/file/40639222586.pdf
    • https://kingcarmotorista.net/uploads/files/1954150329.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae5844ae12---20672816105.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb23c0813---ponupifulipamilan.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/31f3dc1b0ecf08534b930fc8115787dd/18500699560.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c62b5613944---jirumemexowusuwuwudogapu.pdf
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/e79c23c088dc6b38101df62e341e8d0d/furoroxazuzukibep.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd610ee90b6---77042002928.pdf
    • https://alternatifhirdavat.com/upload/ckfinder/files/vakofatelorevefa.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a28481af8f4---65775554904.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae82da1a87c---zopuvoba.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2181da6b517825ff9b79ba37d1ed8a18/18828383455.pdf
    • http://simonkuehner.de/gfx/userfiles/files/17041871807.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/11ukurf6qa3hhfb8jldhg6eusj/60956597718.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=scalloped+potatoes+with+heavy+cream+and+no+cheese
    • 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_off0000e938.bin
dd22e19c639a22794f3c1cb1fd0085535ce22815b8833e67492728dcb0c84e4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 17440 bytes
font_01_sfnt_off00011745.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 16792 bytes
font_02_sfnt_off00012f5c.bin
527ff7ebfb0a5acae36e3946984acce4c15bb5a5e6c30e4da01457f893f6bf4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5C 11120 bytes