Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58f1264f8adc9a3…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 17:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d59bd92b3bd24444dc52e033c8f92c00 SHA-1: c20f46543456add479ab33a91a8c18b93eda05e8 SHA-256: b58f1264f8adc9a3a3e431e0b5e4a79eb29ec5adef7f43b7714a284c65a22b81
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://beeshark.ro/app/webroot/files/userfiles/files/kafolinunil.pdf In PDF document text
    • http://monteconsultants.com/image/upload/File/17110855721.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/41367566476.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c01673284af00ef999494b9001da9182/kupebomebulesuziwome.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/34522172123.pdfIn PDF document text
    • http://unityproductions.com/upload/files/10657450585.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/65731333935.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/67527776867.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/copmskrbmkgsof6rgpjjput90m/mukukigikidon.pdfIn PDF document text
    • http://hotechike.com/files/files/75235740021.pdfIn PDF document text
    • http://cycling-software.com/files/file/27580742418.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/pakunoluvokosisuzugu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092699243ebe---pedopigusoruvefanoji.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/43724995433.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/87df815523cbf6eaa1a4885719035900/kizomometosepovuxalo.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f773be46e6---88034498275.pdfIn PDF document text
    • https://masihpt1.com/contents//files/13244682387.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/sazatax.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/b2jqdd9uvt9la4e9eu6epjljaf/xudokifuzaxuxugidirazo.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/bfa7d9d39c0ef3a7980edd4fd89f4555/favulodes.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074fb900b1e9---44911853895.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/luvalijofumuneninutogofo.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/36223067901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=apoptosis+review+article+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_off0000c4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C6 16836 bytes
SHA-256: 34c655c20411b9c7d068cf300d4dac8ad6ab8013cc6be41ae956c4651367bce8
font_01_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 10640 bytes
SHA-256: 47aa93ad2fc3fbe7755b8fcbf523233c307fec25692388133e942a3afbd0961b
font_02_sfnt_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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