Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61c21554e4d6805…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 06:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e52155bf2c37a8666cd1477f6c2b86e0 SHA-1: a627adccc9a724652fe23cf2938dfbfb724f9590 SHA-256: e61c21554e4d6805805c61729eaab2344f291fa061be22d674f04ce69c8ef135
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4e92c4b88e9bede2c9a21423df2125e2/fupuguj.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613992cce06da---nitudotetafafe.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/47096453775.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/92199838792.pdfIn PDF document text
    • http://allier-genealogie.org/File:/nibovakilixu.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/53644546306.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/wifubefokejoloj.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pizupizebesesutikowegupi.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/voduloge.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wozodaloj.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/15467864835.pdfIn PDF document text
    • https://preciseenergygroup.com/media/fexavewarozumixoxo.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/wivugezebedazudolimug.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380047d0883---wovetogapulali.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/mizimebelubumuvuvopije.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/2531822956.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/2192854305.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/28a2fbf2d3eb8b6671972c32077bbf09/73816415676.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/mupumuvegikidasagex.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/sunoxejamiteruvajavipez.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/ketojusebanav.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/52881166274.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091207413073499.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/mipoxilefifuf.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/nupanibun.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/lokugefasiwapo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=danganronpa+2+sonia+nevermindPDF 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_off0000c86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86D 19724 bytes
SHA-256: fed1862f46576d8620197bdcf624925fd071f253b16df6cfcefc0d97e4f31895
font_01_sfnt_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 10780 bytes
SHA-256: 8c7cec2a92d4c0e2c83de8db51282d67d54010051767d3738d3c9238ab492588
font_02_sfnt_off000114e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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