Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7161e11f820eeb8…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 13:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86d1f71f01159f6c4514d5652cd7f860 SHA-1: ad68c5a0e3cb4a47f46df4956b794ff54bca6b18 SHA-256: a7161e11f820eeb826f666a5efae0333d31ab604ec1561a153bee89d61b7218e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=tamilyogi+new+movie+2020 PDF link annotation
    • http://neboskreb-irk.ru/uploads/userfiles/files/jadomuzajanoz.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/10207603865.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/42677134471.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/44696744579.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/63266742785.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96707edcf---sudewulevilajagabimajog.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/gewas.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/19583711835.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/mamutegosizupo.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/69908184029.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/kabiritemalefotutisulave.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/wibolifezibasolu.pdfIn PDF document text
    • https://phnews.ro/files/file/movefe.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/paguvomorevoxuwobu.pdfIn PDF document text
    • http://billsky.ee/files/file/dazefufezud.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9a6773583a3b6c17c8e4929cee68db46/70409829416.pdfIn PDF document text
    • https://pindimana.in/uploads/file/mijeviribefo.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/56399330871.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161374324133b8---87714338927.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/manoriwokes.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/57901304501.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/45199354584.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_off0000c93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93B 10556 bytes
SHA-256: 1299ff491757a7f8a8a8b026631ed0aacd0693c671f88474b3725d5944a0d102
font_01_sfnt_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 16548 bytes
SHA-256: a889d0d9dface6ebef3559b94784131a0a813760afe420fbec5bfd0144bc38a1