Malicious PDF — malware analysis report

Static analysis result for SHA-256 5678492a04aba69b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 17:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 30fd777f08ac6926ef62cf1979154a8b SHA-1: eb3701dd0092b9ad2fb0944e4f5efce3ae16e79d SHA-256: 5678492a04aba69b86539eaf5ca7a78eb64d1ba0f1ac186ed8aebc682f6b04fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack pattern involves directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/898e39d1cb05a388acb32f3aff367720/78593607049.pdf In PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/gebunupuminogadofebowi.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/1dc0e495cd0640c3edfa9a445c81d7d5/67478717689.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/bonopid.pdfIn PDF document text
    • http://mesterek.net/tmp/74231271097.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/72166089774.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160794ad129be5---zegewulolunaribafed.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b497e478c85---fazifuluvebovefulomu.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/14941790670.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/bekawazibeberulawoz.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles//file/gabozazenujenado.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/17324425927.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/riwoki.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/xupiraduganexuwor.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/kemulike.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2daca5f0a4---fexofoxebufoli.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/zakokazelutafav.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/94465447423.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/3345389284.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160741ca97d916---nitofoxa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086d85181b19---fanigeliz.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/bubakujodafapuz.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/70099178573.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607165e412a34---suwetoxiruz.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/7199299374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=secretaries+of+different+departments+in+the+philippines+2018+pdfPDF 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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 11464 bytes
SHA-256: 90921fcf7258aaf1ca4f717e5340141ddfcd9e77bd773b8b1186cd13f5409f02
font_01_sfnt_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 16652 bytes
SHA-256: 359112f4c5c2c7679248fca1815e5d5dd289b88ef6a63653386a914e74cfa5d4
font_02_sfnt_off00011bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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