Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bef2981ca3da07…

MALICIOUS

PDF

88.4 KB Created: 2021-07-21 20:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ca97120248c2c6bedd1b5cd6dfde9d5b SHA-1: 4cc7385eb442604242f0097f308420c586950061 SHA-256: 53bef2981ca3da07090358db9fcfaccdb2b3d0c9f34abcc22a088312e45839fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. This behavior is indicative of a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160703df4a8b1d---femurukomerupebu.pdf In PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/5d89bad6d76e2b9578fc60688360bda2/60358606394.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd5e24797a9---sizuxo.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/24096943160.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/nerojigawuviwuresusos.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/gatexip.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/898e8761b21a636fd95c29c7c9b02824/vilonovetijo.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/madilovopamofutereremuz.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/1jlm1coo40acjpg62sakp2vhij/3351352790.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/lusamol.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/masetusefesetejazopexexu.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c26cc995c---lefakifuge.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/snnb2fqg9i37p4mspi3tpmrhsk/fumifivov.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/i276bjo8l7adqb8ub5skvqh71r/voguwubujojes.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a42f751cd5c---lojunirafewibaj.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/b4af8ad6b0e4eccab1a45fe49449e1cb/wejopetunoragabimetumob.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/rapamoxefemerolafeji.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/sokiguloxikigopusuzusexu.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/7206099794.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/ruxulibexixebenudejetoz.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c92c181c---33635070209.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/47430147661.pdfIn PDF document text
    • http://fotossc.pl/_files/file/mefupovofametigo.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/55622819457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=car+sized+asteroidPDF 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_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 10184 bytes
SHA-256: 9886e24d6ae4ef1a3171c36aab1e70dc83c97e6e1e806170995f861ee2c53f6c
font_02_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 17536 bytes
SHA-256: e919b6203d10cbc240f4bb0c2e399fab7493d4ea8a0663e16b15f5c17b0823d5

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