Malicious PDF — malware analysis report

Static analysis result for SHA-256 888cdf15336102c4…

MALICIOUS

PDF

72.8 KB Created: 2021-06-28 01:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23626a837770b699b13d87a9fc44c82e SHA-1: 3daf11e13bcff36acb515cfea744f850d35f3044 SHA-256: 888cdf15336102c43b750c551acb90be80a06335565d2f8835d3eef7a8278b2e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The presence of multiple external URIs and link farm heuristics reinforces this assessment.

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://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be6bd6a08d---85518922684.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16078960bcae28---delavuvojukamosadexedeneb.pdf
    • http://extracam.es/app/webroot/arxius/file/nofaxe.pdf
    • http://ekolojikweb.net/upld/userfiles/file/466264136.pdf
    • http://omonetach.pl/foto/ilustracje/file/lifewopid.pdf
    • https://dineflon.com//files/zoxolerozawopobuvi.pdf
    • http://tuzvedo.hu/elemek/file/mojopojizozokinonofegif.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083289e623a9---59745783453.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772cff42aec---wenemaxopugezagaravur.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fcbb19e8---82908412708.pdf
    • http://aisef.org/uploads/userfiles/file/file/71002013910.pdf
    • https://dehayemek.net/upload/ckfinder/files/ritiremebawegopujuzovebo.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a2b30cd09daf464e3364f76ffeed42c0/48010363805.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d58a26dc33e795f7d6d205555451c4c0/55634465505.pdf
    • http://canvangdientu.com/images/file/77669445818.pdf
    • http://ztkammer.at/uploads/file/44791497815.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/bb3c3fde23b3d9eff3bc26db0d0c396f/448721109.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/606b12d0b5bd56f8cde55aff692b72f1/jodetomedakokobetu.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/boxuloxafowonopowolugo.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/qchi9ffpv9i84kgm7b5gogq5cc/tofap.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/5d00d9d1f309c0d336ab48e049f8776b/ribubakaxijuruvewav.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/40b846f58d2c0d7d6e6c867a2617088a/34783616384.pdf
    • http://thermogroup.ru/uploads/files/85680274318.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a17e4d7c44ee8f7c02371f5dc229a44a/dutorozov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=manual+for+cars
    • 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_off0000bd49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBD49 16792 bytes
font_01_sfnt_off0000d55b.bin
3c802b5fb612ce17416c39044cec0ee8ab7be382c68ea4a169df27aa84ccd2b4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 16280 bytes
font_02_sfnt_off0000ff8e.bin
8bf0d31fc72de0e80dccb0a20734e8423fcd530233148b55d0fdf78b18e2e332
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 10100 bytes