Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b63481e9cd5132…

MALICIOUS

PDF

76.2 KB Created: 2021-10-06 23:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3e453533513dd6c08be49ff79fe83e2c SHA-1: 5da7aa567e9d90713aba1d0aca81bb2516a3ea06 SHA-256: 98b63481e9cd5132d632f26e4cb349770c5ca67f30fb6cb1ad759cedfff04fff
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://mstreatmentadvances.com/userfiles/files/lezos.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161366d6d354b2---33475502665.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210906172758.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/77190737011.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/92927275575.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1615a6859b316b---gevujugagige.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/sasidugubi.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/kajenibexulefaguxoxiv.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34514948931.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/fikibemutal.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/xopopitogajedinavenesigu.pdfIn PDF document text
    • http://robedecreateur.com/img/files/bawajeverosinuma.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/22268065275.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/xewovepam.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/65465805508.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/57307945985.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/4f64s2ufri6ughdtdr7ihthiq0/47257969141.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424632deba7---23461728936.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/rinawefaxezedabuwa.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/60689386988.pdfIn PDF document text
    • http://houselandia.ru/files/30394830750.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/jazozeligifitonodoxituwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=stuart+videos+from+mad+tvPDF 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_off0000c38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38B 18116 bytes
SHA-256: c6ac6553883d5a47a7f1a02cbf0642d6a94491f6408ceab9379ce657d73e9e25
font_01_sfnt_off0000f27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 10604 bytes
SHA-256: 73c664364ff6dbc0495857f7d29076d0e57c83fb98dc7b0264b1bad2cec08cb0