Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb599e9a8692cc7…

MALICIOUS

PDF

67.9 KB Created: 2021-09-28 16:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b56374a9f20ea913c1f242d1c390701a SHA-1: bbd52b7786bccc074778afe87b414e8e2f5eeedd SHA-256: 4eb599e9a8692cc7e4c724422c47466c7ead4e3cd4e3858674c8fb4eba7cc1ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised or disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using these sites to host or redirect to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://old.arcnet.org.tw/ckfinder/userfiles/files/ninonamamedarutejufer.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614921e4140b4---xugedivigasexokilazasel.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/14082461658.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/49018860371.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/zazuxemaromujokom.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/rezoboruvu.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/44873975774.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/fipinufoxiwejapu.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/67596693040.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/36084046471.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/dokaf.pdfIn PDF document text
    • http://eclickapps.in/userfiles/files/girarokuvup.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6bc9d6a2b---85622706587.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/bobatisudewedepimutem.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/lerupogosumober.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0a33d73ae---98793977656.pdfIn PDF document text
    • https://bfull.ru/uploads/files/zajume.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/murivamosemezukugona.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/retepesapiwowekozemino.pdfIn PDF document text
    • http://art-ball.net/files/file/77313770625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=ebook+library+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_off0000adeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FD 14840 bytes
SHA-256: d101b9b10c47c15ba29e20c44ad6694fb95b5a58317cff802f0ddfd6c4057b77
font_02_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 10320 bytes
SHA-256: 7dfe807621de5cfe2bb4ab78918661df336b2dbc7fc894ef29379a8bdbd7dae3