Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8042a18e0bbbb1a…

MALICIOUS

PDF

91.6 KB Created: 2021-06-25 22:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2aa7b656ef06ca8c13be5f6c511c1c6 SHA-1: a6854abd8cd663e6b14875c86b0bccd3295f5258 SHA-256: a8042a18e0bbbb1a1a7133ff1dd415531c7f4aabe1ce00888c4e33dc84ac7c43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the compromised hosting suggests the PDF is designed to lure users to malicious content, likely via embedded JavaScript or by exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a8ce73e451939563779078e67195cb8/97521229033.pdf
    • https://dijitalsanat.link/upload/files/9991296106.pdf
    • http://c-amc.com/upload/files/36765851261.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/33015807735.pdf
    • http://skiflogistics.ru/userfiles/file/226572988.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c72d198dc3a---rerabafigajef.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/6c887fea15730455a86465cd8123357a/9892083745.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d5d581e76569a0046ce186cfaffbe900/77436993921.pdf
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/38110176364.pdf
    • https://cambodiadriverservice.com/userfiles/file/zidav.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16098bd282941a---84936937791.pdf
    • https://anfauglir.com/images/file/12631024563.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/2mtf0ae9i18obasp77a4n0osj6/23502216160.pdf
    • http://parkwaywest1974.com/clients/861606/File/tawijul.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/c70fb9c4ee97ada9751716856e68b110/gapogilabojuvaf.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a283285ab---71943633495.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36c8755a76---besuxezimomaso.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076fd3c59fbb---75186355290.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/9ucld84mfv3pde8ejjtn5iaikv/73532440549.pdf
    • http://alexlunacoach.com/img/editor/file/10880517473.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e032dbfdab88fc75297dae4823711da7/sazebo.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084277301f37---56267193529.pdf
    • https://dm288.com/slicice/file/jopepaxenuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=rusty+sputum+meaning
    • 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_off0000fada.bin
b495f376710a94481b3da530f1502c9765676f32690695645982068a1e139db7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 10588 bytes
font_01_sfnt_off0001131d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1131D 16792 bytes
font_02_sfnt_off00012b2f.bin
00209b2bfa845f4f919118ae22568af65dfb82f0fe5d99a3aef88002d59776c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2F 22412 bytes