Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a3e8711f28f10f…

MALICIOUS

PDF

83.4 KB Created: 2021-09-08 21:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 00b83f6fc0930c4cc61c837b2478d28c SHA-1: f197f2e7b010d4eec45bfca5fa4bf66b30f911cd SHA-256: 90a3e8711f28f10f7eadf87e696ed6f050ef47fdb5fd21b7e80d88a3e891ba98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/7hke47h2mknj6fhqla56ulnis7/dasibumelibofubuxufos.pdf In PDF document text
    • https://sofahatinh.com/upload/files/kosefomuxiwa.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/8196138762.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/62548456620.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324a3d7d9d0---88537934986.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/87517843363.pdfIn PDF document text
    • http://usateatop.com/_upload/files/35950101535.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/87277409489.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/30012663522.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f79d7c91a6---dojulufojejixov.pdfIn PDF document text
    • https://ip-pharma.net/data/files/91571591.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/973op0qp999bn99d6nm1ar8a35/sebobologepa.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/95006445200.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/14045872682.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/2b489d9166278be70e648dbf97baf80a/78471142802.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/pipilunomibadaxupopod.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210907_40DAF98EAA2A0C68.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/22709387267.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161389f88a7a83---22118235169.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133f83b0d3d0---sonimej.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/5ca4c14da8e3eda30dad5e84a8e95f13/zanipojowuxe.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/refewefolalujabisagemipaf.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630835231.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/38733117773.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/wupelemukelobotube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=luis+barragan+book+pdfPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/dovopisiririjizabexodajir.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_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 20024 bytes
SHA-256: 04c7b6c6242db04c192a157ae1c2c0c95a18651dedf50feb3e7bdb50f92c34ed
font_01_sfnt_off00010f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9C 10688 bytes
SHA-256: 7040493e1b3bb0e39849d4ed29c045c55addac8bd5f4e3f1fee8514f0ec0aa75
font_02_sfnt_off000127c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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