Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c83339893ea18a…

MALICIOUS

PDF

87.7 KB Created: 2021-09-19 21:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f0ba01a55efed5716bd760fb3f5dd464 SHA-1: 79f872f0f9fa5d26af4e6e3e342c804220c66d58 SHA-256: 32c83339893ea18ab98f67ea24da0db5b83bbc12260f5196d671462bd1d07122
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to potentially compromised websites or phishing domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate initial access via spearphishing, leading users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://festival.bg/fckeditorfiles/file/borosapaxemovimifexodoso.pdf In PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/fizegeso.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/misugev.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/635f3588e0b8ae20b1ba2a324a6a3d29/76506404628.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/13822067947.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/noverejewo.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/refejom.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/giwonifupig.pdfIn PDF document text
    • https://khogiaydantuonghanquoc.com/images/news/file/xopubasazogemibifaxoj.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/34384637936.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/nenuvenododem.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613102d72c3ff---7602580188.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/mijuxexowademirober.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469d7e10a21---7681603966.pdfIn PDF document text
    • https://euchebnici.com/img/file/naxinixurifaj.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d1b5531dc97e7c4ba46469a9f477d16c/betagoxugabokudasofasoba.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/53148050528.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0me65f6pfv7cb7sqruhglahp6c/50881520342.pdfIn PDF document text
    • http://denge.aero/upload/files/mozofijideluzos.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/62b2e4e426f4f16791dbd23c230841fb/16590017615.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/xeridemukuwanoxugovep.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/59750690964.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd38fc45eb---jezajexumipatuwudex.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/bokobupetun.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/50405198375.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=como+eliminar+archivos+basura+de+androidPDF 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_off0000efe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE9 10876 bytes
SHA-256: cdd15e5d8841d9447ab874208c89266debe6637daadc57ecbc4d99cfe40445f1
font_01_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 19276 bytes
SHA-256: 8226026fbb0678a9c57f701aa3b6803a0346592ca15f00966406e405437d9f9a