Malicious PDF — malware analysis report

Static analysis result for SHA-256 46114b7a7c9521df…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 21:26:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f7741802edff93ede4e09709ad8fa2f SHA-1: 7e41a6e15b644e783a41bdff8731ae4a112f4b49 SHA-256: 46114b7a7c9521df4f370ff6c6f05b6f05907cd86816cc1f9d9759b652d9b6ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users. 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 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c80c6601bbd709cd75f4acfbc425022/76827010626.pdf In PDF document text
    • http://sloplast.com/userfiles/files/22405776846.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161387e3a6bc95---zewag.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/sixabi.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/powodob.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/86561905078.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/banenalixerufita.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/lixubuduv.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138de56cee33---damunu.pdfIn PDF document text
    • https://ambalatender.com/upload/files/wikamisalovemi.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/18757734065.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/55089369449.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/55394541294.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b51ed13b---8736573963.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/6f6964a9a702baa6b77e72d3cc0df053/suxesawazatefupuwu.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/97802009676.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1851ea96f736ec7365809ca3168a4e83/30780240393.pdfIn PDF document text
    • http://btfa.tw/upload/files/66951633608.pdfIn PDF document text
    • https://jagominum.com/contents/files/11385194699.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/lumirufo.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/nuxowesureferukoweleti.pdfIn PDF document text
    • http://movediary.com/userfiles/file/16250991616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=far+cry+apkPDF 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_off0000d68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68F 17704 bytes
SHA-256: b312e39226a365c9872d511cb1a98fb48fe019e00be7161c90c7b6c1453780d7
font_01_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 9788 bytes
SHA-256: 92f673ad0723dd91a372863555eef266867213fc797b7a84321a5ed13178f701
font_02_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1