Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e70ce4c1ddfebd…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 01:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 346775571b7ac8c49e6afb2d0ebba623 SHA-1: 4a8a5ef7b98071351810209933d7e53947c8d8ff SHA-256: 51e70ce4c1ddfebdd235e11a2ff518614d4e22e7f442d63f51c44861a6502a32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further malware. The embedded JavaScript is a common technique for executing malicious code within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/520f067b3b07f721488cb27d2d130bb2/38166963045.pdf In PDF document text
    • http://flagrant-desir.com/userfiles/file/76164169480.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/50783091153.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8ac09455---fupego.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/98851486540.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/naxomigipumofobum.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/vomajukudojil.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210826105234.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/48804278650.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/cdfiisijo412ij79fcf1hed0v3/67939677070.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/ramizexapurogegumobomu.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/zuriwejaxufigenezu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/b0a8674c546a0a7cf205b504ebacfdbd/2759880553.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/57072gv88skc35n5gfl5hesf7d/zuwed.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b576badb1904e69453b80add3ed332de/79347272871.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdf15a45d3---daginubipozik.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ffb96bcd42c---jabinojovadipaganufisafad.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87f9939d89---niruleputarebowupuroz.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/wijozunax.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/iccp8p59p8sc7gf6hlm22pvjc6/91655075767.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/98790051759.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/0d5cafd403e0b7fb632cc3c2c2da8172/99772013765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=inflation+using+cpiPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/kapozapasutelotuxuxi.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_off0000e876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE876 10472 bytes
SHA-256: 5572097fefa8886cacbde064af68758812cb55ae2eb044d36ff3353124d4770f
font_01_sfnt_off00010064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10064 18100 bytes
SHA-256: 5ca93eaf1121e249f9eb7ec8cf8c7c38393847e1e2939aa3c257f707831c994a
font_02_sfnt_off00012fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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