Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d311d0833164535…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 15:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88d254da502baebae6b7b0230fb6147e SHA-1: 8da5d6e843de84f4bca0778c76a6a5364307cf9b SHA-256: 3d311d0833164535fec8d2bb785c8a936a154ba800e6feb2f8a2813c12c1e945
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pixomot.ru/uplcv?utm_term=control+cubase+with+android PDF link annotation
    • http://architettotamborra.eu/userfiles/files/24294643870.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/xavewoxojajebujanaz.pdfIn PDF document text
    • http://scro.ru/pic/file/53062885740.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613036c6c7dcd---weronifapekagejifasebuvin.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/kefetitugafosuxapukom.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/29326692139.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/96304683325.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/62242990076.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/tmqt3bbvslr4lijdpelt23jcv5/sedoxibimuzi.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/lixoropuzageguwo.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/newiromitapomatozafozore.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/65837517430.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/86265778966.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/84688044863.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/35552229872.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a1f067128213f7668f012242d1d6cf22/35207959663.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4b0aaf3e1---kulugif.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/77313336487.pdfIn PDF document text
    • 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_off0000d705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD705 18344 bytes
SHA-256: 9f389552928b8d19d4c21faa2d5943b4915457b3cef8649e61870eb5f2cd1c6d
font_01_sfnt_off00010707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10707 10824 bytes
SHA-256: cf83aa9fada758136ac1c11cb99146f0aefb4b280d2d7b56983028653e17abf1
font_02_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1