Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f444dbcccc875d5…

MALICIOUS

PDF

92.8 KB Created: 2021-06-28 12:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc6c207949a947eac93f70133ef22796 SHA-1: 2a74531633107fe88028663b3b740b236d0ffc07 SHA-256: 4f444dbcccc875d54188314cced7d3317ca46f628176eb3c70fb4301450f5709
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160856c4e54eea---bapulutazemebanerit.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8164f416b3---99823474692.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73fce6ca1c---53485361618.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849d66d0806---34937307512.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8394bff70ae146b1d421a62f2f4dbcf8/zidonitomafaw.pdf
    • https://aduanaldelvalle.com/userfiles/file/giretisafusuza.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e6c2595eb---43942827869.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/epjbq3b2lfg4gcqu6avse8fq9b/rameguxit.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/jqcrdjhke9j3s4cfidtlng61v6/67047223518.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083072bb6325---nisokejegekitupala.pdf
    • https://accuratesearch.com/userfiles/file/zugegetejewagob.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae62706f0d---vigazijutebuniwekudazag.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/u8ubobi0ckh46h45k76hf65nfb/xusuwarikozivitogeb.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/12fba9a19cc13c2b873bb39148fb9496/fesevumo.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c2566b24a---fetiwadavojalisasitawo.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083946e107b4---falosovufigesatopuxub.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6399126cd0a9eb1e884cd15c57d78b90/wejodiw.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6c131d61414ad454d020d570e86d4166/67143546146.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/5qarkobdho4dpsb6q05ornau2o/lipekojenu.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/0d0b338cf9fd2b40aea2b078ee5afa82/14567410321.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/rpeloc1l070fn1qsoc6rcvd0t4/11253728864.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=spring+force+constant+units
    • 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_off00010583.bin
753f25ec77b80be9be4caee0a1f54692f2b98e5a48610a2629948b1158aba538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10583 10784 bytes
font_01_sfnt_off00011e79.bin
6bc3ecbd8b2f5823b4b2dcc8b684ddf0210629e8252f44b07241a43e4b2d08b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E79 18044 bytes
font_02_sfnt_off00014e63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E63 16792 bytes

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