Malicious PDF — malware analysis report

Static analysis result for SHA-256 e848e025807491f9…

MALICIOUS

PDF

74.7 KB Created: 2021-09-24 18:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec56d5198bfa825692dc06ca96ad17eb SHA-1: 190d4285217f19e9673694adddcf570c0249211d SHA-256: e848e025807491f96e9b4dcbc914eb595a8e78dc5543c87dccb710951c34d840
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The presence of embedded JavaScript suggests potential for further malicious actions, such as exploiting browser vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161351bbdba0e8---29913448414.pdf In PDF document text
    • https://gianlucabruno.it/dati/upload/file/15924388490.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/zosutapinudomowizorakexis.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/luwivekazeleda.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/gonapodow.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/80981437345.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/zunusaw.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xodesuvajaja.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/jekuwebulefetipe.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/figomoluni.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/rusewosudupofajo.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/muzukowaz.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/71313184717.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/loniroduwasipeweroxepuf.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210923015705.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/sakaba.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/05cb6b256936ae229117db428e8cf4fc/wuwusunutoxoxizup.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/44739881320.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/bumedezazoturekow.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/61966015898.pdfIn PDF document text
    • http://stattus.com/assets/file/duxaxo.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/6645888671.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c3a82a4e---84735872816.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/nigogiwav.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/71301337742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hr+block+loginPDF 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_off0000bfd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD8 18088 bytes
SHA-256: 7c074d810219068ae751a6e522e10f2e4717fbcc318a2faa7ee5c76f92225c0c
font_01_sfnt_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 10068 bytes
SHA-256: df54f0a15952b2503f9434f4fdfd8b707ff8eaa018a1bdbe63ccc5873569e49f

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