Malicious PDF — malware analysis report

Static analysis result for SHA-256 2592d4a8964cb401…

MALICIOUS

PDF

93.9 KB Created: 2021-06-30 05:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abb68bd8819610193f49089e1ac4ab5e SHA-1: 82ebf407d76fd39f1118a46ced65909a5b1e05b3 SHA-256: 2592d4a8964cb40170f0a27e5c5ae40199c1096d684191db8e9792f4c6c760b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, specifically within the formcraft plugin's upload directory. These links are likely used to host further malicious content or redirect users to phishing pages. The presence of a link farm and the use of compromised CMS uploads suggest a campaign focused on distributing malicious files or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb73aa72f---47918239767.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/4d3d5ec585dd1f5a6475845859634d15/vuxasezobukogixipizun.pdf
    • http://thuexe7cho.vn/upload/files/kewukugedadaruditedoxo.pdf
    • https://people11people.gr/uploads/File/satexomijisutuf.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608921190cab3---41350140572.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4dc83655c---37764720472.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8230c576---69450450877.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c59ed0bc55e9af5bcb8ebaeb1ee6f5ff/78512011409.pdf
    • https://myphi.biz/nbloom/fckuploads/file/63923445226.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcc19635b3---86596604762.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/8b6o12kpjjfa5fpq3fpms05ab4/lerixiparales.pdf
    • https://ckmusicdesign.nl/userfiles/file/sezus.pdf
    • http://auburn-properties.com/userfiles/files/48240768835.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c6d53d44---wajugidikarerodonolunode.pdf
    • https://aimara-bg.com/userfiles/file/84940791969.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b664eba79cf---17042143148.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0e1775b29---falanilovagizoxesodizor.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160758d7a5decc---govesutezofegujuwor.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609803747d250---lijowe.pdf
    • http://aftckwt.com/uploads/file/96829419721.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/hb0l8ag8qs71j1iivkes1e1qj1/fusalonilan.pdf
    • http://auapp.ch/userfiles/files/sugumanirarowegefogalagus.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5565e5df79---21880261613.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c154caa9baad86d97c5f8f99b8ba668f/moxegabonuwezatamejunuv.pdf
    • https://vicotelecom.vn/static/source/images/file/72815712364.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=converting+chm+file+to+pdf
    • 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_off00010a27.bin
0e848e4fbcbc3687c1278e9614088f9423688cd638ed6a94003c6e53632edfea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 17952 bytes
font_01_sfnt_off000139bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139BD 16792 bytes
font_02_sfnt_off000151d4.bin
53c61b311dc664d309770754206f8a2c160d4537da48fc104bd3aa88b48de46f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x151D4 10836 bytes

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