Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4d233db36ff1d6…

MALICIOUS

PDF

105.0 KB Created: 2021-07-28 06:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 548eef567455c3c16fa80a5f574823b7 SHA-1: 66f3778de99139f1ef100587ba43d6838449fcf7 SHA-256: 6f4d233db36ff1d65190bca7dbf11d29f0fc0bc23c842892bc797e095a9cc1c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host malicious content and distribute it through a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb4419f61b---jigafaxoxofewiragukupuvu.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160edb832ad3d9---nixituz.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e93c2b61e90---satujuwufu.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0c75ffd4---tujumunilimodubit.pdfIn PDF document text
    • http://coronado1977.com/clients/54390/File/3033704701.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/273525a55aa7535145395356a1b36271/86413747791.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6a3de35dc---lasakikuruxuzijisoko.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/ropawabogomuxet.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b988c80c2---zawilekimopaxubifunote.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/55356315888.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/muvonilofatonotezizuwa.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/tilosunamerijalur.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098e4800996f---ridipavipasobafitafutid.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/61432194768.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ca752b77---64894143415.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e6a9d1afe12---gijobutemikexezevejaw.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/0e37bf276484bbdcd1f7aa6275c5ec5f/87728343658.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/npvkhp73v7qipelf6iua9mceg1/82724406577.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160723972c1e00---18599689361.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/gegulutusi.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda42c9feef---gukekozowixisozozat.pdfIn PDF document text
    • http://cecev.com/stockages/files/pawowomer.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b29d70cf---96175093710.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607235589a1dd---javebumiva.pdfIn PDF document text
    • http://stevis.cz/files/file/jularamekixovoremave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=actuarial+mathematics+dickson+pdf+free+downloadPDF 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_off00012feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEB 11144 bytes
SHA-256: a4d7d0e8ac411dfc5ab2f76b28713e46d869ffea6efd07c8d33c4a366921a9ed
font_01_sfnt_off000149d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E6 19268 bytes
SHA-256: 34368eeb88830d4b0613c30e397148d2927ee15d6ae586ba64ffcf637cca263f

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