Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeb1fc6abe859cf5…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 23:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3594936e28ed6d54d4d70e2e747dd8b SHA-1: 580f2bc7763a88444a072033e23d6494a1c1ee96 SHA-256: eeb1fc6abe859cf590be4273156d51272d211efa346447c59b849dd8f9c00e9b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on various domains, many of which appear to be compromised or disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, and the presence of 'utm_term' parameters suggests an attempt to track user engagement with potentially malicious links. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=spy+mob+cam+hack+apk+download PDF link annotation
    • http://bigbazar.cz/is/images/FCKeditor/File/kozumimesusoliz.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/56542209720.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/tikulifamiwomadawukigufu.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/gunubesililulege.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/15316207950.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/63272346132.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/431e393456b5f23ef5ff4c158e5520c5/27189563892.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/fixunilubaz.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/69177302581.pdfIn PDF document text
    • http://sentai.cc/data/file/20210906_234634_260.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613199b66e317---telemenula.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/30510605916.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/63316563027.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/guturakexojagogoliz.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/niwubekaposak.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/vufufo.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/likufigimib.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/powekakilofuti.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906063742764064.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/lawif.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/98312763838.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/rexuvitonojavajoroviwabug.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7ebee230---dimaxakomebujorigoxagobo.pdfIn PDF document text
    • 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_off0000d655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD655 19876 bytes
SHA-256: 98f36d12087434b4c92f54fa480cc06f195fdf63b4ca989b46cce22e20e2090f
font_01_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 10696 bytes
SHA-256: 1fa802b9e401236ebddb4bc74703017a74e2a4636a9a2b54a8f8f9a673753322
font_02_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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