Malicious PDF — malware analysis report

Static analysis result for SHA-256 4148bdbb9fc19455…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 23:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d53a87035a327d2b40cd95d9e3b0a4fe SHA-1: 432ca30491b5b4e24f6376331cc3f2fc40e3d7f9 SHA-256: 4148bdbb9fc19455987f96864df760c6d95b17b55fc9686c9d96b34b6b0c3632
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a13d0ea8a5---karafizezufesalenebiwa.pdf In PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/mimaxijixiso.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/pigavapidenizefaluti.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae2ada735---kuneximigadoburuliwo.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/48755605122.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/48912982962.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/91233286213.pdfIn PDF document text
    • http://eksternest.be/images/file/72725035247.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/mulig.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/29873043059.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/20879944598.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/lomizapubuvum.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ddef6f653---sezegurilal.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/53357173394.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c479d2b1b---dukovarajifazawenijugoro.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/fuzadabetobasuvujifu.pdfIn PDF document text
    • https://mauspro.net/upload/files/xepigegurub.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/69829922144.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/toxerakenep.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904150416201008.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39f4bb7a5---7997130465.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/34841141389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lehninger+principles+of+biochemistry+7th+edition+free+pdf+downloadPDF 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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 17936 bytes
SHA-256: cf56cc0503d295daa3abab5fa9733b9d995c52a8c92e8436a3a5aa8590efcf24
font_01_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 11412 bytes
SHA-256: 2facb96fdc9ffc4cb5fa2016363f8c2050c5f045971d7f458561dbfb09792605
font_02_sfnt_off0001281b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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