Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5850c146dd05560…

MALICIOUS

PDF

88.8 KB Created: 2021-09-14 13:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7f8d426664b9c50a9738e9e906158a1 SHA-1: b6c36a4a2b98e2b8412965bb896f1e0843946eab SHA-256: a5850c146dd05560f67151e6c91f736aaa6c446258d845834188a78e921b20a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dacinsara.ro/fckfiles/file/11854642062.pdf In PDF document text
    • http://kencert.vn/uploads/image/files/45907376513.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/digokovova.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613896a0bca29---dirodo.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/17345213387.pdfIn PDF document text
    • https://tl-systems.hu/files/files/22403730909.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/579b8f91ccc35fa6f0a93947aab2341b/pajanozilixerusajevafu.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161384b0bd1e5f---kuzikefatutaga.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/jitudanejivivoxarezusup.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/58227631312.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024dbe9aed---botokekomesosineropunos.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/7123270966.pdfIn PDF document text
    • http://samtekelektrik.com/files/fufopajupubez.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/45709783921.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b5ea18263---figomesud.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/bebabazupenatujavula.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/voweru.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/meteguduzuned.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/43992483645.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/fodajewefoxav.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/sivemes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mod+apk+of+shadow+fight+3PDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/bokakaduv.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_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 18836 bytes
SHA-256: acbaa5a621636c502078fde41441433f201b6f0d23048c893fc568dd6dc4d546
font_01_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD3 10740 bytes
SHA-256: c5153da51341fadec383aa69efefcaeef4b699bd293318347615662adf1ab0fd

Open this report in the interactive analyzer, or submit your own file for analysis.