Malicious PDF — malware analysis report

Static analysis result for SHA-256 479b93f937f61a99…

MALICIOUS

PDF

93.0 KB Created: 2021-09-07 08:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07e37546c03f2571452c6d11a8e5b091 SHA-1: 327b5f2a33db4d71bdc80cbd18f927d390d5aec6 SHA-256: 479b93f937f61a99075c432774d19877824d155778bc7f615fc84d36066705e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://17njl.com/userfiles/files/xetokes.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f429c86b937---fevulalerefakedinulokikiv.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/kovuvovunajutaradegasa.pdfIn PDF document text
    • https://senhewood.com/d/files/wigip.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/virogenerobam.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e27b8cec2---88433387818.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/waxuguriruzibib.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2dc697d21---xiwezebajudulew.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/12111697547.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c819ad4800---pikakuxida.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/23692259747.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/19529328116.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071411253480554.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/vexukonoxutuvizirim.pdfIn PDF document text
    • http://hla.vn/upload/files/54414424834.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1f3368cc7ab2fbc1191bc0a8eeee1742/55803896584.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7393230370db1523bd1454562a9cd7d0/66584852743.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/wotejog.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b74152b0378209fed6c3e35e367f6ffa/63970991350.pdfIn PDF document text
    • http://webursitet.org/Files/file/81480170089.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161032254acd92---natumajaxigevuxemoborevif.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/wepexapabuzalabetad.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087b9faaf9a5---tuxolojegorenepuxon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=bally+star+trek+pinball+manualPDF 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_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 10792 bytes
SHA-256: 068d7ec8695f15414b5e2e0317f7130b27d6f65a8452c79a949130bff174e17c
font_01_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 17832 bytes
SHA-256: 1c38188859eedf012aa1647c0a219444613f5fb5ad0610e6039bf72b4515f0d9
font_02_sfnt_off00014e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1