Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b855f7428e6d360…

MALICIOUS

PDF

75.7 KB Created: 2021-09-04 14:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6a23995e9c50f136eb595caf616dce87 SHA-1: 9334196cc13e6d36f53e5301e92d29a728b67b98 SHA-256: 5b855f7428e6d360c854343bba9a35668d78ea4d5602f0cd84e085efe8b11797
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely serves to initiate the malicious activity, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/6cb928f9a61afeae91e1b3624dc88b33/96368663319.pdf In PDF document text
    • https://arichaindia.com/userfiles/file/gewug.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/63516991735.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f4fd2bf90bb9b61978c011818a36ff2d/46171648196.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/65933147730.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/9151076881.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/97257017100.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/vorajivolajefixud.pdfIn PDF document text
    • http://runo34.ru/attachments/file/fipuzebikaselivupidefapa.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/e107e4e431bf513ade45b98ea783a424/bojiri.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/5a1c39e3546cb4404764424825854699/kawikin.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/xedubavin.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/cc7d7a5e5c02f95ab521cc4aa2c1f6ef/kopabopusuvirujem.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16cdcbc9d---kimepowoxiduxukozalunek.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/j79f4cg90vgn48o63cpgppf2v0/buvadapudogemidagera.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7816c9d15---38977836154.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/givaluwat.pdfIn PDF document text
    • http://congtyvima.com/images/Download/41464545536.pdfIn PDF document text
    • https://mmszke.hu/files/file/lefelu.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/6602845847.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/xurulezisub.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vakitobila.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160acf227897b1---87537235456.pdfIn PDF document text
    • https://proxus.nl/file/waxapijidofuwolub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=falsedad+documental+y+laboratorio+forense+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_off0000bfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE5 11112 bytes
SHA-256: 798bcaf977f17cd913e9ce7bfbc9bb07ec7149c81e81b3d9953b3ce1d16a780c
font_01_sfnt_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 18744 bytes
SHA-256: 058793a33923d9a31ae9878dc245e73d80a20740245e23b69e42f434a995c277

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