Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4a3990af5df1fa…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 11:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 935a4e65807164295b807ab45aa65d05 SHA-1: 4c54f37bb8eb2df88a15b3b2ce15bf264ed4dc84 SHA-256: 6b4a3990af5df1fa0f646609ab9d9c33e5b1a381aab6f55b89954101a5ea2f39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=cvc+words+starting+with+k PDF link annotation
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef00bb7883---91164637100.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/17055750135.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b417b41017---furofukegi.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/27327916151.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/89994692358.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/36031287037.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa70a2a280---dilofezetuxomagilej.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/44337466811.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/66772088814.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/67691488557.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613448ffea9d6---54395439746.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/15983295213.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/kemosebu.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/78939154304.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/murasezugajugem.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161361dd9d07db---popeso.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/52567863478.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/lugaragafegiwusajetuxan.pdfIn PDF document text
    • https://thietbigas.net/media/files/fosoxojaf.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/mufuwoxurewod.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ef583c75---36772150586.pdfIn PDF document text
    • http://www.520amis.com/upload/files/dawegiserorijiw.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/76456969945.pdfIn PDF document text
    • 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_off0000c829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC829 10744 bytes
SHA-256: 9cdf36b3c19330fb5f631027cb37481fc928760fde04ed12bd4b069c52016974
font_01_sfnt_off0000e0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A6 18044 bytes
SHA-256: f0f25ab9156c33e013b0b5bb502a2e5c4b8f6a563ebc8b094f090afdd83f7ebf
font_02_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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