Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66c9b0bfccb2b0f…

MALICIOUS

PDF

76.8 KB Created: 2021-09-16 14:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f631904e91b56fa469b20590f334d70c SHA-1: 4534c9874ed997270bda8c27bc3a2c3a380e9772 SHA-256: d66c9b0bfccb2b0f23579566f7ff876763f87dd2c19c60058a901e9a9fe1f61b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple domains, some of which are identified as compromised CMS uploads or disposable hosting. The primary purpose appears to be redirecting users through these links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://healhumanity.foundation/userfiles/file/14575631607.pdf In PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/xululeramoxofigezad.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/68605766114.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/92440288355.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/botijosotuditozinuxasasiv.pdfIn PDF document text
    • http://change4best.ru/upload/file/87035451251.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/58303972871.pdfIn PDF document text
    • http://jyy.jp/ckfinder/userfiles/files/20210916_014959.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/22771131420.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae4934329---xakorimiru.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/015937d0c9fb3477fb2eb98566f822fc/wowulibizadelowugukile.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/86027673907.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c181dcb16e988df1450e2eecd949e6cd/kuvaxasoketarujabutup.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/jexewakoke.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/41663955283.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/jobezimobijixiwugan.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/22413298705.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/balezu.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/8554945619.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/disusitolujex.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/viborumimasodujifowudona.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/26163157462.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/fikazud.pdfIn PDF document text
    • http://ranchobg.com/img/file/romukudip.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/57563926631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=euro+truck+simulator+pro+apk+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_off0000c6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC1 10804 bytes
SHA-256: 2f5722a902878db10d2d1eaba1f3e291782517d054b8378227e211750c291279
font_02_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 17844 bytes
SHA-256: 30fdb0164c8175040e9efc4b559bc78be58436af81782190611c295966e383e2