Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2adce52541f2029…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 08:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1fa106f3290c502c667d58ea871b9793 SHA-1: 9c6f959f6a50148c36e443eb6bd5bf54c16cd76d SHA-256: d2adce52541f2029ab9201f6dedd01ae9a8c5da5d143c923e70f2212af233fa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=iron+man+mp4 PDF link annotation
    • https://pachetedeturism.ro/images/files/80803085625.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/nevafubonodirabowis.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/jurenu.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/34484586310.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109080505003996.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/67781051320.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/64316352099.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/50737973121.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/bepixamiker.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/96086635277.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/20329358207.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/forip.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9aa5b827f46ff628924805ba1d4a9f8b/24155999771.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e308a3c24f---57140698296.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/37890105530.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/49806324005.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/jelixit.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135fa760cc42---livubupejolegataxaboruwa.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/84499054833.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/bilobibajazad.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/31839539528.pdfIn PDF document text
    • https://path.mn/userfiles/files/34244416930.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/medexevanu.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109181251453242.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_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC39 18004 bytes
SHA-256: 88603af544ba98cd4a5dad08fd7392241c0c81a54a05d52fddd211ec6e804468
font_02_sfnt_off00012b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B01 9908 bytes
SHA-256: ba04c0f7abe56852cc62b991db6cf106862d9081ef10ff55b5bdcf5593352705