Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf313800dbd4c2e3…

MALICIOUS

PDF

100.8 KB Created: 2021-07-31 19:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e3a24690e46df2fe72299451edbe0506 SHA-1: b2db72eb73d90753914d9a5e3027a2ed1a2cd955 SHA-256: cf313800dbd4c2e31dc169e4cb4dbda8511dfd4fe2b92c9de862cbe83c33b59a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to execute malicious code or redirect users to malicious sites. The PDF also features a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://ebal.ro/app/webroot/files/userfiles/files/pubinilomubidupikasebef.pdf In PDF document text
    • http://axwelindia.com/uploads/59972210759.pdfIn PDF document text
    • https://myveolife.com/wp-content/plugins/super-forms/uploads/php/files/e448b4cb58d2b2dfc8c26f1ad4bcdb28/48841798644.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/gorup.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/jukuwikagofubirawutisewe.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f724bc0c1f5---rixafadarit.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44ea9b258---53426729523.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/fagiwadomina.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddb3765fdd---25141689732.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0496688f6---lanujaredurijenore.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/72207907139.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/5pleskq9e8o3irs7066tt2k79m/sidumaxifufuj.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1ea3602e---68053530399.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/pefigufojezunasanoke.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/26470036592.pdfIn PDF document text
    • http://soflocops.com/clients/67403/File/67634808678.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/1976072617.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/ralibalijinela.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/xipupunusazotivunelofod.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9ec2f972fddd915eec68896e0bd5bc8f/79154028999.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/nodegasanolodazobajoza.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9cc33ef17d---kefarilasodetukaxoda.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/rd6kkmti7aeaj7pr3bkgl9heep/14736449281.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/41577719228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=say%C4%B1+basamaklar%C4%B1+ygs+%C3%A7%C4%B1km%C4%B1%C5%9F+sorularPDF 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_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A3 11032 bytes
SHA-256: 6d2a2cb443b26ced7f5d3a183f9d7a8ce021ed567fbca9a1789e971efd71b533
font_02_sfnt_off00014da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA3 21376 bytes
SHA-256: 57525c53b408e41c8c5fc22e6e1102f659bb1880cb255df79cbbe80c23929972

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