Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d11007ca64a8e4…

MALICIOUS

PDF

91.7 KB Created: 2021-09-17 13:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f343450f6dfc8836a89828b8b677c9db SHA-1: 6c2fb1706e68aaba15b873f6114f3dc5dbb4c846 SHA-256: c5d11007ca64a8e47bccd021f8a6653d960f24aef5345f08617f4bd7747e1850
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 a phishing trojan. It contains embedded JavaScript, which is often used to redirect users to malicious sites or download further payloads. The heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133582083783---gemabenagidezenepaxatoreb.pdf In PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/tinusetovuxajozi.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090114063070554.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/semimaroxodewu.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/49605132503.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/xitunumawekuvakanafemi.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/xemekusezata.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/xalogeketef.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/dusepinipileletifatipup.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0441b02a4---datoninufetimojigumago.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/waviru.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/27714405592.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/dedatezumamijafuluxewewuv.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/77928929522.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/nilivuvenupovusevonev.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/76520426139.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/67472bbe0697a0d0c73aa48e7cf4a48f/lerulijulag.pdfIn PDF document text
    • http://swhos.com/upload/files/93149429788.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/75280283058.pdfIn PDF document text
    • https://fond.ru/userfiles/file/42391725691.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/51711932942.pdfIn PDF document text
    • https://arabadvertise.com/userfiles/files/10893206546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=global+marketing+8th+edition+pdfPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/32242075268.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_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 11256 bytes
SHA-256: ab5f98a10203581f9ad3643f30808d3785206bbcadd5778508fe846fce476d54
font_01_sfnt_off00011739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11739 19584 bytes
SHA-256: 176e96ec18c83eeaa368bec98ee7b681f351c7ac622f96fbed5d08152fcd07fb
font_02_sfnt_off00014972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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