Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27465c3fcb1e15b…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 02:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a00409f4f1b58096362c6c3dfbe06cb SHA-1: c541afd66b0b3c4998f2ae2a9207ba5772951e54 SHA-256: c27465c3fcb1e15baecc9d796faa44b58d4f936a81baa060c399fcb6913b46ee
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://computer-rudolstadt.de/upload/file/98628235747.pdf In PDF document text
    • http://wdnederland.nl/file/36691437716.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5886ecc0---95541240972.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/83793815538.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/zewajonawufokewuz.pdfIn PDF document text
    • http://learningkey.org/userfiles/77574114302.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/rejurowefefil.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/nevuwaweve.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/37143893329.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/jaxedonozewogireriga.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/83326778982.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8553b2f174---bedujajisabolatepaxewa.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/bab3178b05804353c2a9a2a255046a03/93617921602.pdfIn PDF document text
    • http://erictex.com/ufiles/files/70257266694.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d675db028a9---wojezi.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/35250473625.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16090b6a7a9126---46468615037.pdfIn PDF document text
    • http://thediamangroup.com/_images/files/xejezoremidaduzupipevu.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6kd8ftfqh9g6r1ltbrarvbj3hn/30450984502.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/povezotuwizivudisezewev.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef00d8b56f---83033518193.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1d8bb14a2---12910036531.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tukefifizu.pdfIn PDF document text
    • http://snsi.jp/image/news_file/dogugef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=production+process+of+portland+cement+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_off0000d5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A1 18032 bytes
SHA-256: 0c3cf2926baa72e7f00a79d8424989f40f7ef7a938c729b4c4b2235524b8a8d3
font_01_sfnt_off0001028e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028E 10884 bytes
SHA-256: 2744cbb312fd3427c58474948f38317c1856261e41d50d889bf32d31fcf02629
font_02_sfnt_off00011bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1