Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c9af97f175ab11…

MALICIOUS

PDF

87.3 KB Created: 2021-09-18 12:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7684eeaa97a4a8f321ae3214c581eda1 SHA-1: fc3d827fa452fdb75fd6d9b920e8d6768964f580 SHA-256: 42c9af97f175ab113e26fcb0d7621aa65c0a3be548f5622908c50cfa31f0e6ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, suggesting a link farm designed to lead users to malicious content. The file's structure and the presence of multiple links indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://happinessgown.com/upload/users/files/25183352664.pdf In PDF document text
    • http://parfumerieindex.nl/images/uploads/vonofajisezalopulozu.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/21857998447.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069ba186fa---sitebagiruxavaru.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/69925706171.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/3115175525.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/85862932566.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/26539782154.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/42394934745.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vemovisunubujalot.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/23811196053.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/7ed87a204c194e88adaa8c4b521fe796/vemigasononotevaweboje.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/tudafa.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44244306915.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/95843837989.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/d3635b8b381d531e41f558b7346d52bd/marelijowarupezetijakep.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/lewikuj.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/73048930908.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/getujomuvo.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/xusorowujozukatusixawin.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/33229668322.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/xobotapuseki.pdfIn PDF document text
    • http://linza-market.ru/upload/files/41036405079.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/55965120464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=frans+de+waal+our+inner+ape+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_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 18412 bytes
SHA-256: 6d8f673572f32642b00f50b0d509c328732f34537617cea816e9c57a9e1cfd1d
font_01_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 10556 bytes
SHA-256: b91ff1a6a951395d05e7009338a03b9758c73b2ff2f297842e36dda1ac7eb408
font_02_sfnt_off00013782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1