Malicious PDF — malware analysis report

Static analysis result for SHA-256 952600a2f2faa1f2…

MALICIOUS

PDF

85.2 KB Created: 2021-06-26 00:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16fb0352cc06d2effd25855058809de8 SHA-1: 0a144c2f9fba40fca8f8edfc1c276897aad80a7d SHA-256: 952600a2f2faa1f2a51c278b61f0b02e168ed854cd6d7a54990272564a01c8ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://mfcwestenkwartier.nl/beta/userfiles/file/80315823248.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/li1qi0jvms3kb40mem3vufjcb6/18395142553.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/dc716f00b42108f9d535f37284f11953/dimobidunitawetutafujof.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/71ns06dvipiobj5kb59mvig5q3/zisunorigezulefosir.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5e6d5611b---61310892639.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c415414cd---2599738144.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608b08214f7c7---62845076702.pdf
    • http://wamer.org/userfiles/file/giwimeremokawepelilez.pdf
    • https://floraplant.gr/FCKeditor/userimages/file/vexoduvakabedebolexixoz.pdf
    • http://fred-robin.com/ckfinder/userfiles/files/53284840451.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609182c227d56---32304498668.pdf
    • http://rentbucharest.net/images/userfiles/5424304969.pdf
    • http://heibldr.hu/FCKfeltoltott/file/66605654069.pdf
    • http://sungsam.net/userData/board/file/49909301872.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608337176618a---83016481258.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/40010548613.pdf
    • https://muratay.nl/userfiles/file/jomusowaguwipesalebikuvur.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5870875959---78809956697.pdf
    • http://ahchala.com/img/file/degadiwelini.pdf
    • http://skolicka.eu/foto/images/file/53058468350.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080a0e508afe---17581995114.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a685465cd---gobox.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/pf88cqt9huh1e1e89qltrmmma1/bokilare.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35cdb8028---rezajilojifitapobetu.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad9e77a596---388733516.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=largest+company+buyouts
    • 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_off0000eb03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 16792 bytes
font_01_sfnt_off0001031a.bin
845359a041266b25b2bdd95a0915d67746eec44474f7e4c23bfbec2fa3700e22
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031A 10888 bytes
font_02_sfnt_off00011c1c.bin
bbd2ea0877de8b463fe301ab3bc495892693c020c08121facf69dc00b6d02c96
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1C 16684 bytes