Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ceef6a0713ba85…

MALICIOUS

PDF

93.7 KB Created: 2021-08-16 05:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1e96830b590fe523d739ba0aa66b3874 SHA-1: 4c260d8e28aec3f008b747016b71dd0df5518322 SHA-256: d3ceef6a0713ba857d906a1fcf9cd157ac14b4b9883b71f27d26544840c77d34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the PDF is part of a link farm designed to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=what+changes+occurred+in+voting+between+1824+and+1828 PDF link annotation
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/2871006510.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/27636432632.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9993cb131d1371b35cdfc6c446062a39/20318354282.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/bidiwexujesufofaw.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f03661d18c---xejikokeriwiwujapikapeza.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608359efa493f---99603885526.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/55466002292.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/5420369314.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607da0061ff73---88818573946.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/35264478445.pdfIn PDF document text
    • http://didopack.com/files/zobipanivevitepuvat.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dcdb01dfc6ef46f94061ea07d122fb15/40964152858.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/valeguguvisenej.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/pipove.pdfIn PDF document text
    • http://dentistturkey.com/image/files/49790066689.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/zitokotufusetu.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/lenoxubuwatagu.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/73091502357.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/23297dc7e8b66107ad18e606c114c385/91502680143.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/5s2q594jc3tvcso9c94gaj3g89/20127542525.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/rukorinevitikow.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/25442129597.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/99392388853.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a2fc94f3a763c23842789099a1e01d94/3242727429.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/94eddca87b439dd4c37fa7ba8cc08d1c/94615681408.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_off00010626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E38 17344 bytes
SHA-256: 689c8222f9fb35dcc6474ce2c49530ba9f7db0bd461c160675e5a171adc7ab07
font_02_sfnt_off00014bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCB 11444 bytes
SHA-256: 397cfcd55cc789d571557f83bcb0366dcf624e4357df468d8fe34adfb8aa2e83