Malicious PDF — malware analysis report

Static analysis result for SHA-256 378ce34aafc8ff97…

MALICIOUS

PDF

86.5 KB Created: 2021-09-24 10:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aa2653d933ecbdd173ad3880bf3723a2 SHA-1: 63b1cb97ec8cb61f9c08d7ce2b3946251185a805 SHA-256: 378ce34aafc8ff97446c5b7437435fe7890ac3d2f636cbd47189c7eab217fec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to various PDF files hosted on potentially compromised websites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://georgewongdesign.com/gwd/upload/files/galazujupoz.pdf In PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/najunerekikaliroto.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/litupe.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/timodemobarexiriguka.pdfIn PDF document text
    • http://laguna.piyawatgroup.com/images/files/77696770855.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/7252447411.pdfIn PDF document text
    • http://cke.hk/userfiles/83824194339.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/34319020704.pdfIn PDF document text
    • https://e-room.co/userfiles/file/47514315732.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/42362621778.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/2177df1b4c1df249373936825f0877a0/nevubaponijewuziwetanes.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451d31b72b2---zezob.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/ligebeto.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/regazoruvokurarumapexamul.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1e45e490---77972075042.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/vimoxedagunikunoj.pdfIn PDF document text
    • http://sial.pl/galeria/file/50600529381.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/digofubijumo.pdfIn PDF document text
    • http://vswet.ru/f/27754079772.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/26705945228.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/fisopitowibudir.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/48354330416.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614605a52026f---dipulezineredafukudax.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/mimosafoxawafijareg.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/sigetazinozokinadesujivas.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/63150253525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=free+instagram+likes+100+realPDF 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_off0000edef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEF 18092 bytes
SHA-256: 9aa1f0853d87b0bd405921fd5bd5efd4ab1c56bf503f9d6700765711bbf7535d
font_01_sfnt_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BD 10576 bytes
SHA-256: e7bd6d8c39ac892bdc57de90ba4aaf0e3ed0dd9c739600f3ab236205cca21a9f