Malicious PDF — malware analysis report

Static analysis result for SHA-256 c48bede8a4e51347…

MALICIOUS

PDF

73.8 KB Created: 2021-06-25 05:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0248ebb7f0e80b86496f0c5db5c11e56 SHA-1: 399daf3f8f792179364ac8cd27bcd8ef09ff7691 SHA-256: c48bede8a4e51347d261afe6a89e511e9f2aeb3be7296baf001ad4726e412614
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing lure or malware distribution vector. The document functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories and disposable hosting sites. These links likely lead to further malicious content or phishing pages, aiming to exploit users who click on them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=normal+distribution+derivative PDF link annotation
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/c0808m6j9v2qfmlrp9obh6c6ob/23077282536.pdfIn PDF document text
    • http://goref.ru/files/file/bumalanifu.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210619061030_yoph4z.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/93nd2jkg282jq9njd5ur1ik77g/xetubi.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/kgpicl3jokcn4okp8mnjvm7b43/fojesugusipiruketapijod.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed4f77cc63---pajabetepebujo.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086e75bce943---nemami.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/sorijosisel.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/dulevupefan.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983314b7196---tejexotajigowag.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c92d0a862b5---50287285579.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/zilimuwukubimadefe.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/38591785036.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/29294982629.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/vadrtbk53dhla7jhgk6kj8h6v4/wewugatar.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2670beaf---15354614042.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 5140 bytes
SHA-256: 44e6f697f266164ee7f589d2ae575eb6a287fb78ce5d040a3c57679af27a8957
font_01_sfnt_off0000f3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D1 11316 bytes
SHA-256: c413bbc306417d774bf60f4e7981376cf126ac4b3889f40b87fddaa39e747d29