Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6e520b279813b6…

MALICIOUS

PDF

123.6 KB Created: 2021-07-20 11:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ccf91fce74bc26a4207f27912f248e8 SHA-1: 85a045e92315becd454032e04c3c8d73488acb2c SHA-256: 5a6e520b279813b6611977b64616d6d5bf1cf695ea4b5edd9715fc1e7c3be3f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and the ML classifier strongly indicate maliciousness, and the PDF structure suggests it's intended to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://summithigh75.com/clients/867147/File/wugojixunopogaxoza.pdf In PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/warekomogu.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/95647272010.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1621009125.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5d9f6212e---nizawib.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/91525202260.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c5a3b4a7200d42cbe756fbb2ec9f27fa/96107277825.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/43565880771.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1106801ac5---lumotako.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/2511319089.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/1f78f19f0aea9ce12289c5e06671e324/bonek.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/jijumabaganobixorunovofa.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/91723251713.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/5303496064.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210524210931769.pdfIn PDF document text
    • https://protrialse.eu/files/files/dimamoxupaz.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1935adda8---vobarijodudojosamugi.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/nesejosekamopodesuli.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/b459336a2c09d0d800ab054f1fc49873/58664227917.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/dobisi.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/25aaeac4d6775772e6e3af1b3f67bea4/xegewewesaluba.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/98672445726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=stokes+and+green%27s+theoremPDF 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_off00017a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A52 10760 bytes
SHA-256: fa0e55cce98cce26446397e656bc01eb4d45e01c00f1a2e953e457fe461b9581
font_01_sfnt_off000192b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192B9 19640 bytes
SHA-256: d9bbfa721c0aeee7f5d21291948c4168215d3d2d2e66d0c275cf14879640e24e
font_02_sfnt_off0001c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1