Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f6fcdd56742017…

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 10:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7ecc59069fe6ed783a3b872447396117 SHA-1: 2367402a47df7e685e1160f213c2b71ce7b843a4 SHA-256: f5f6fcdd5674201739ef3e8a39547dbaf2d46cd0622018cd13b7dfce03148ba0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The document body is heavily obfuscated and likely contains embedded JavaScript or other scripting elements that facilitate the redirection to these malicious links, serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://catequesisnavarra.org/guiarte_userfiles/files/49245941602.pdf In PDF document text
    • http://etpatatietpatata.com/userfiles/files/datolutepavabuxikudomozu.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/10338612479.pdfIn PDF document text
    • http://dd-eng.com/files/files/ridaxidud.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62a6dadebdaa21f9e3ad6e3a83327894/lefizidanuviz.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/vajurogadewudobapetulebaf.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d4d1b977010c2180d529c5b8715a3769/56134217390.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/b75639adfd981a3d713e808c7b1bfdd6/pawufajivu.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/80884459834.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608550d585e52---24804639548.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f802b2ba19---wugirewesotazoziforufegup.pdfIn PDF document text
    • https://red-adlay.com/upload/files/19046052090.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/xados.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/vn7t32lcvoulv2j7fa4fsm81l5/xupezotobovetolinugoduxid.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/36909ad8c26cb324dc18ccb12badaa89/963950771.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/mitilajodagoligapaziji.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b392156c8ed---fonigud.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba15fe35b84---bezatevemerotujav.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/83156763fbf906ba655cbc8f79c8a7f2/lusasewexotiwumanonema.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/rodote.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/65900556153.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/555e068bb2723e267e6473fe1aae907e/xukumatikirarototanem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=school+uniforms+pros+and+cons+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A4 10828 bytes
SHA-256: 234c32b5b4fe0e35d3dfdbbbfc275d05fca8cc1de83d1020688ab1763af941be
font_01_sfnt_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 15252 bytes
SHA-256: 161c56c6550f8094b75ab1756840da7d55412f1a6d68c838aa50242685a1b61c
font_02_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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