Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2053beba3d543ea…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 18:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a7d0e84ce286c514b8575726e37261e5 SHA-1: 551c7c8e3a671151277db9113687ae4bc5557045 SHA-256: e2053beba3d543eaad31a62cdeb345e8e59154097bef800ecc00ebb1cc47ae9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ecf3d37f0cd18cf9bc4614054ca6cf23/62500277328.pdf In PDF document text
    • http://suvagcentr.ru/userfiles/files/76013503211.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/egaovh3ba5vhiquu720a1d1u83/mutajofuxuve.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/52678791893.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf74935ca44---gosefuwasigep.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/sijodid.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/16552297049.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/gorigem.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/xoxesitobow.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edfda38ec5c---67865056005.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/11459145023.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/tipedujimuf.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/viwilepobabewedorovukeroj.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/voluzodozufil.pdfIn PDF document text
    • http://ativn.com/upload/file/56711230240.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/54594542329235928725c21a50f951ac/74097813728.pdfIn PDF document text
    • http://machulski.com/public/file/98284616097.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/fukinopalobumowitawu.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/jozuganejenugunikesapuv.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/36a98ff06b0a24247d863739da3cba99/bomedibisuperep.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607916027b740---wovurugewabipufinuketuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=convert+png+to+pdf+ubuntuPDF 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_off0000d3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 10540 bytes
SHA-256: 13ceddf7261b7bc67fa6a17e34603dc1214af21bb5cb709c3cb21b087865c758
font_02_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 18788 bytes
SHA-256: 74396904626d5917e0a949e9662a42fb50199084539d7e7ba258734d8b6c94b8

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