Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a88ce8caa459a9…

MALICIOUS

PDF

73.5 KB Created: 2021-09-19 20:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a13eb5966a09b50a5ff290b8bae63c1e SHA-1: 0e2797d869d64b6a11e3d8d41ac86d2c073b5c78 SHA-256: e6a88ce8caa459a912e33cb827f727a81a23e9a0b715870dfcf215fc60af7674
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrastone.com/userfiles/files/29581464446.pdf In PDF document text
    • http://iberia-ex.com/images/blog/file/62358839486.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/be0cd611a60288a435f4e06082da5d54/67612883087.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/mowugigezebivejaparodeka.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/timunevamozofelexu.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161370db81aa3f---nokakiw.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614153f32e761---liwev.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/71745881768.pdfIn PDF document text
    • http://dentherapia.hu/files/file/26173980452.pdfIn PDF document text
    • https://ubranni.com/uploader/files/63055743096.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/zuzaxikexo.pdfIn PDF document text
    • https://online-wums.com/files/files/lazimibixex.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109141042435902.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/giwapogufarigajuxurodelo.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/28341560081.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/46666981541.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/68370993954.pdfIn PDF document text
    • https://mmszke.hu/files/file/57952736582.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/8880012246.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109151159142056.pdfIn PDF document text
    • https://owop.challengersports.com/userfiles/files/26624957290.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/lopurasafutejetege.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/70579811896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fauji+game+ka+linkPDF 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_off0000bf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF23 16856 bytes
SHA-256: 0e6d8974ab701a9245cc0503ef0accf211c5d4a5a062f721b36f34386f167803
font_01_sfnt_off0000ea4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 10264 bytes
SHA-256: 9696fba24f4521154f48be081e97b0cecb46429c5d5bcf88c572c7e738291770