Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bee001bdc0f5bf…

MALICIOUS

PDF

88.0 KB Created: 2021-09-21 18:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fcd21a206fa1e90b6d2fa204aa78c0d5 SHA-1: 076fa3bd0c0c4ab4d76a0ccbeb03eb1b4dbe2cab SHA-256: 84bee001bdc0f5bf6144db84764df774fab9dbb04866a39e7d7eb13c7e29be50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://tahubunting1.com/contents/files/57594806947.pdf In PDF document text
    • http://fpole.ru/sadm_files/48505775856.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/tesiwudawezezuzavidutij.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/ruwumakag.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/9006458172.pdfIn PDF document text
    • http://surausa.com/uploads/files/xerogawekozunakolomune.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109190633545744.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/givesuletaxewibijimibe.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/14968227057.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/85159926496.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/9rdo1tpcfndal0uvf369p1u9me/68969114234.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea3ed2a3b9---bimajupofowof.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210913_112149.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613beed13f72a---nomuzesugilodobefubewuw.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/532b54724af33556ec66c606fac265f6/71949175476.pdfIn PDF document text
    • https://cooperspick.com/files/jelaxi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/40896bcd1e14d7f4915441b401994bd1/lipabibumomudubusid.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/gopujidugoxexijamu.pdfIn PDF document text
    • http://aktifmedya.com/dosyalar/files/zodurufeletavofudixa.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/getoronetiwomofujenu.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/rakorawapakeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+photos+from+your+phone+to+your+computerPDF 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_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001066b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066B 20092 bytes
SHA-256: 4b7d115400dd9e654351753203729432bb3b0fcacecd187198b8076876dd3cdf
font_02_sfnt_off00013933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13933 10920 bytes
SHA-256: 70b5ca2e7f2b13712fc34d36eeb8bd46b7655f65b670491bdca52c01c07fae8d

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