Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68103051b9765ec…

MALICIOUS

PDF

72.1 KB Created: 2021-09-11 06:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00cb83f2341293c00b377e3be81b5df1 SHA-1: e47072472ed1d212cc5bdefccb76b09f48de2fa3 SHA-256: e68103051b9765ec040294c2a8dfaaf94144cdd38e6eb55f960e6513a02b4c37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also hosts a link farm pointing to multiple domains, many of which are associated with compromised WordPress installations or disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://01host.ru/userfiles/files/26394201530.pdf In PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161308eb80f2de---wenunorosazarumesoja.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f54723852---94521183625.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/fudiribomumomowexijela.pdfIn PDF document text
    • http://katela.net/userData/board/file/zofuxowepanaf.pdfIn PDF document text
    • https://intersat.lv/files/file/susigugixelofedagijefak.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/mobarax.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/14171811305.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfd7b199d5---70915493519.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/71577637605.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/gb4irqk8gh7bmnumq10qmfsgd9/wedavelewotobo.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/fonukon.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/files/66499575889.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/nedemagobubiniwadobonona.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/65369257061.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/dosubowopoboku.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/dekikezamug.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/xowibotewuwedo.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/34076808058.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/mepogejesazupemapawadibuj.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/91466552312.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/31184399301.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/25890900804.pdfIn PDF document text
    • http://raczcsalad.hu/files/12187926910.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333212c8fd9---56683717806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+17+sexyPDF 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_off0000b7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD002 17092 bytes
SHA-256: f711b1233809f92cf8ab53a082101125c1cb9edf97aed98c5bbec3cbbb174612
font_02_sfnt_off0000fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 10236 bytes
SHA-256: 6d70e1ca9e3c50b1a23949611f3247e0fb50ba50c632c5e10312df892b47390c