Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a9ed7eeee51050…

MALICIOUS

PDF

76.1 KB Created: 2021-09-02 18:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc535c345c42d321fe4f044fbf3f5df3 SHA-1: 583d23f7523ab2e8d5ea7e56717a993e9572ea87 SHA-256: f2a9ed7eeee510501cea6ae6e6b7b8db0fbe03e792cef953add4f2cbbe8e7b71
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such links, often for SEO manipulation or to distribute further malicious content. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://architettoangeli.it/userfiles/files/vakixifobobefumezof.pdf In PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/pamododofebekuvokere.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/tetatevakunejofujiw.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/zojilavejekakog.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/61700780012.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072bb7f5308b---39250636283.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/12550061036.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/54011890077.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/busit.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210804004144.pdfIn PDF document text
    • http://msamericapageant.com/clients/873634/File/81297409197.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097f9d665be9---32791180867.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/gilefufataxakeliwu.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/16334732787.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/6030f3587e3961d8a4441194d74d4b63/sosifujaxaduk.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/57408941244.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef64a05823---gasadigapo.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/16495028270.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cea122672b---21864332761.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/7884451988.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/boxalemewoxuwelusupulob.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/83004561148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=ambi+rad+ar22+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_off0000c7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D3 17120 bytes
SHA-256: b6bc1c0a60c4921a7285a50f57d9cad000ff2610f873471b1580cb2603569ffe
font_01_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C03 10232 bytes
SHA-256: 85d89ee4df45193cfef55a04d2fa8c1e01588307a4625df779a9fccb44c09440

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