Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecc9b02b5a2d99e…

MALICIOUS

PDF

76.2 KB Created: 2021-09-02 02:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9143f80d631730a58f2f7733b9b61c07 SHA-1: 1daded6ad1cdc6133464f81d78bcc5f241c766b4 SHA-256: 1ecc9b02b5a2d99e534811b9c7dc04988ca1aa1e1fdad423f118126609455e8d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://greenfuturevietnam.com/Upload/files/54318512032.pdf In PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/gaxezatitedadilo.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/67851716648.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/guzobobewujilejagevevax.pdfIn PDF document text
    • https://banghenails.com/upload/file/30263727446.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608110604fdf2---fogajag.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/0bd91c0b0bb350553bba29720a5c2bae/zasusamuzimujevasevo.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/37043880618.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bad840a52b526e8fdc10bebea490f5af/74563217344.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/82771593649.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210730_C95BEB195491DA27.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/0bb20affa2921e935bca653e30b0dbf0/29155596367.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/vasozupumaxiguritezogover.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/xibusoxukamu.pdfIn PDF document text
    • https://goodline.by/userfiles/file/56535253267.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/fatizubixebo.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f41724b9bf8---27270238902.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/53054358173.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/xefekeno.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/ritivinatamefanodupufo.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb82bc690---58818050094.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/bglecte6r6ovd3kfn7k3nkatp2/pirate.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edc57443878---bufotita.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/21788197318.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb58db7df---11378349560.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/66608976530.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/73394782021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pediatric+physiotherapy+assessment+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_off0000c630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC630 16656 bytes
SHA-256: f71b6a6d3b50689c52ff41aad6f0c087716ae25b1355015da03205e15f28df00
font_01_sfnt_off0000f131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF131 10956 bytes
SHA-256: 154722ac3c0ad0a0de5e0fbf2a5d8a962db6b62cbe72f0729f2a5ed8596f0cea
font_02_sfnt_off00010a7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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