Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6c66a6c059d585…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 21:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4955fb3e6a94794a22ef962847bad016 SHA-1: 00048c635a606c6140f8ba887ba17f7c80693d51 SHA-256: ba6c66a6c059d585a8922d8bab25d10458ce012c2e5471e4052da72e08a6b649
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, utilizing multiple compromised WordPress sites and disposable domains to host or redirect to PDF files. The embedded URLs and the nature of the link farm suggest an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.alapan.org/fckimages/file/80091011419.pdf In PDF document text
    • http://iwilldoit.ru/uploads/files/files/23351779765.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vi3rf7dfp27et42m6utof2em90/52864677184.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/22425749140.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/zumabiki.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/77370feadb777b9fe71056eab88631bd/83649066586.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607364edddf44---5837773297.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/49270931308.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/79836676812.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/97a16e25c583607ce06130289e877bca/86647432085.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4f9a0939f---togukirud.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/20226463048.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/77682114411.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/fiseriwilojojepivojer.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/94535623761.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56017e6185---totexiruwixagadema.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f64d0f6379ac34d71857ba09a1e93b15/ripumunirigigobavabesuze.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac201d80caa---pevisofesuna.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607177164aa28---wobixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=acronym+of+your+namePDF 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_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 19204 bytes
SHA-256: 6f932788fc02a09a0b2bc772176dec21ef85519c836c6049aee6cefddc4bea8a
font_01_sfnt_off00012431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C48 10288 bytes
SHA-256: 03bf628230d7d88564e9809d6c34c219e0cf07c040ca2dc7fc4472acb212c54d