Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba125f3a65e0005…

MALICIOUS

PDF

77.5 KB Created: 2021-09-03 03:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5efd5f5a0d190091f0048aa08df1f527 SHA-1: 0e0a89bfd6f2b787cb29eee80645e7ddb3e2ad50 SHA-256: eba125f3a65e00054811c914690f853c8f4c53ce6a151df2d3650610f0ab3ffb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution page. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://pistant.ru/uplcv?utm_term=filipino+reading+comprehension+worksheets+for+grade+6+pdf PDF link annotation
    • http://tnslib.su/userfiles/files/7369375670.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3093c93ab6f221268fdb48a888ae41a7/liruwegunirogukoxuju.pdfIn PDF document text
    • http://teifsepahan.com/files/file/zevigojo.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/25120945665.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/fepujinawawu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608df36c64e01---lepomepelusezokawawixat.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/f7d7e8e53e95da1b39b01d683bf17ee3/radazim.pdfIn PDF document text
    • http://cutskytools.com/d/files/fuzomaruluxesudigazop.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/simivovo.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/favagafalokimibe.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/vokakabobemi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd6fca03f---91207399941.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/punideliwopomew.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/fsolo86fh1o2ojfq89v949lkcu/wibejepuwusi.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/bovixewowapezowozus.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tiwefisewowafoxome.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/72907386010.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16108a71f170d6---19393834697.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/bq8va4sc0ht07jl6hjct56tp47/mozesipasubu.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb3908fb43---masomuvewikujelezi.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/vobutobujapivuve.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_off0000c8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C8 17404 bytes
SHA-256: 7d2303eeceea76689742ed5d51755ed101658b2fe32955bbe462801123715d61
font_01_sfnt_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 11392 bytes
SHA-256: a6e116227d88c6a34c812261b0768389732b2eeb8b65a6b90a75c671dbef5489
font_02_sfnt_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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