Malicious PDF — malware analysis report

Static analysis result for SHA-256 47de35f6fde7e169…

MALICIOUS

PDF

86.8 KB Created: 2021-08-20 07:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b16d71988ed9da1dacb69b8161088d78 SHA-1: f2b044a72ebe230b0e319552810b3e2df1147bd0 SHA-256: 47de35f6fde7e169f6d63951dd3093a33bcfd9ff4d14f2db312c4d1815877454
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://forglass.sk/userfiles/file/ponegogadegubawu.pdf In PDF document text
    • http://anandtouristcorporation.com/uploads/88621893719.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/11683318100.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a64d3e95c42---26008709195.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/22163051758.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/pobirigifafabikodovamez.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/82daab300b7062276fc9d4ded01747f7/vumalakezo.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/8s4bb7l6s6233v3dvs3kq3fndg/mumirojobanemumanolufur.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/bc3df8d3b763b0a0b19a6e7fe812e6ee/fafijem.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/97839586057.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/62002478799.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/55538839774.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/junuwaseridir.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/fotazixovuxagafefosefak.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95474927613.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc32ee0eee3---95929627015.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/kokunixojop.pdfIn PDF document text
    • https://senhewood.com/d/files/99306690151.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/138078749.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607be734b934e---81300994846.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/46868089871.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/41633048621.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/tikimudepag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=different+branches+of+philosophy+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_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 16468 bytes
SHA-256: ec1a544d780ac4e233405ff94514065c63177c471f223192de6c310bbab86d1a
font_02_sfnt_off000131e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E2 10972 bytes
SHA-256: 7fd0fb06e7519bd38dd1db58a24441725056e7598259cfa8728ef1d6cd44b10c

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