Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8dabce6c07e5d8…

MALICIOUS

PDF

70.0 KB Created: 2021-09-06 06:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93e8fc699bdfbed862e176f6ae3bc554 SHA-1: 7508b2c8b38dde4cf0dbd035c5b1483235b5a928 SHA-256: ad8dabce6c07e5d80950886463d75dce77e9eb4fab73c03434a4c9c958914d10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate an attempt to lure users into visiting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cortopolis.ar/userfiles/file/geluxararowolorubekisuz.pdf In PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073202526137---41415322827.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607593c81cb19---87970759725.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f94cce25---luvepudofixobesakavobalog.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081a86a3c639---55902075464.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/pebexudorugotemikoril.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/31931525373.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/jatabipikapa.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/47722007740.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/jigivifimosaza.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/rofav.pdfIn PDF document text
    • http://chieucoingason.vn/files/jubumilumabuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f9cc01b888---8845654937.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/174794caea85711791ccd2008f429b22/60846099130.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/44794776350.pdfIn PDF document text
    • https://petikdaun.com/contents//files/57397749264.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e5e412df1---55942135776.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/fu2kvfsumuttnamjmk6evulmen/jigexazoxufuzasorurib.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/32269438399.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/nafuja.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/347e8ed68793faa73259fea53efb858b/riboditebuzalim.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/jkp4e8p0gdq5v09bq74ses5qo1/71071480101.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2a4e57f42---42914545404.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/95268918647.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/rowerojulelal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=awful+auntie+pdf+free+downloadPDF 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_off0000b3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D4 15112 bytes
SHA-256: e83286733d1a33438c963a7c52a9b3acab1893924bd714592cd27b3d88e41665
font_01_sfnt_off0000d9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DE 10492 bytes
SHA-256: 2bb422a1f6baf8fc78f7cfabc4738d4c3f8704f79834a44cb968c56b548cd215
font_02_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1