Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c9b36b07ac59cb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 01:01:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f13a2d5e4dfe05420342beee72168c81 SHA-1: 6770e228522b77efcd633f7dc1f214e216db82f6 SHA-256: 54c9b36b07ac59cbffa4785f3812869a9926bce1304f8929bd2f8486942dfd5e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/863591b0b081461fac2f8573c4f50091/xowenufemobufuvala.pdf In PDF document text
    • http://compufoxmail.com/userfiles/file/24585159267.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/furojenuxufopojubezix.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/44463171861.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b987849a241fccc1bf86009e448f5c3a/nigofosomupe.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/mujuti.pdfIn PDF document text
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/juwomusewetinesineni.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9c583edcd601fb6f698ab149485fde71/22893367807.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/15055517704.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/75412531701.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/wozijuwi.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/16151430494.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/29598437214.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/buvugalotibobepozamixib.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/23574303403.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/jufunimezowijinowasazuvar.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eafc472e04---palowovedagaxoju.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/rusobeg.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/sikorowodozitumojurunir.pdfIn PDF document text
    • https://silga.ca/userfiles/file/zudugivuradimafe.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e62c754b88414804a2dd31485d1a5915/fatisaposufokiger.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dork+diaries+crush+catastrophe+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_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 18636 bytes
SHA-256: d45b5dd8117cbda7e3c2213eb14d9c666e38dfb4340f3eb4608404219e7c89dd
font_01_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 10760 bytes
SHA-256: 086862c1e155fc12a87134d98925ee56e0fbbdaf0d02191664e175a42a267534
font_02_sfnt_off000119ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1