Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecafbf2546474e5e…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 09:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c9a9417063b31b912eb21fc913a0c707 SHA-1: 2045be4b101e8c12869bfb5fe6ce526fc8b1833a SHA-256: ecafbf2546474e5e31182e53639e053fd2e783a4ec9233fec16044dc91cee56a
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/6671888961.pdf In PDF document text
    • https://kimansion.com/uploads/file/jisufipiwegutedevorid.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/dipon.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/3045869794.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/6296948905.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/76bc976631953dacab3edd60fa918b9a/nitupuvobiwirov.pdfIn PDF document text
    • https://j26clean.com/upload/files/resexikuxobi.pdfIn PDF document text
    • http://thaifilmind.com/upload/files/vuvaluruxumibevoti.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/xugepogakigofezujetabex.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/zufovewivijotodotewoba.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/19176167626.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/lufisenakivudukat.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210912082211699759.pdfIn PDF document text
    • http://rld-carbon.com/file/67508357529.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/jadadopigozo.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/tq3adogdcm41jh3jvo55f7h04n/koxalavubomekisiwigi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/fe8a738d7c3080aedd7ece56dcea1222/8727286231.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140035d04c7a---mozewisilesosigen.pdfIn PDF document text
    • http://happy-land.hu/editor_up/lomugusovopipovubob.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f676110d0---jigiwavofapi.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/mipuxabaxarab.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/85404840404.pdfIn PDF document text
    • http://cke.hk/userfiles/81996138808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+playbook+kwame+alexander+pdfPDF 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_off0000afa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA4 15136 bytes
SHA-256: e9c1ce81a65d722b1c1ceae92349227d1621a3e0e9e1beebba0918b23a61865c
font_01_sfnt_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED32 10900 bytes
SHA-256: 1576b35360acd4c3d9ed434ea7074a45d4fa1aa728ee2eb6897543f7c119ea58