Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe11a5414118f37…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 20:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c4551b11332dbe91e2300a5a8680a32d SHA-1: bd48c24d1c54a758f8a5d049e6159457738de4bb SHA-256: dfe11a5414118f37d000a721d716be4122947fe9a0df1896052361d7aa1c28aa
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://woodwaysindia.com/uploads/xadamimutom.pdf In PDF document text
    • http://sql110.com/pic/jibitiwerovejimiseluke.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/cdcbe4866200f5bcb0657328d08b27bb/82690572793.pdfIn PDF document text
    • https://samavetah.com/ckfinder/userfiles/files/fubiwubavekameka.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79ec84e741---94382551260.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4027a5f0f---juful.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ant94vgm4uh9r31h97ps616av3/poxiporotaj.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/936958768.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/63381943530.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/wokejasizajozuwaju.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/zexevobogaw.pdfIn PDF document text
    • http://amandamaitland.com/images/file/wimibabofepuxile.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/l4ir2e87oret8f5pcq6sb2s63k/85144761718.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/fozeminikiso.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/40135879547.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/39285398025.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/95596295593.pdfIn PDF document text
    • http://es-hanasaki.com/yamituki-n/uploads/files/41229449499.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/bironixatazevim.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/roxosawujevar.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3094dd8d5a4f7a5d3bd74a80b20a6032/3563228612.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/temepuzafinasutuj.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/10383159395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fideiussione+bancaria+per+visto+turistico+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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A2 10852 bytes
SHA-256: 080b688c0fec2fe41fe9b4ff127de0cb83064cfc030fdab794c1c63a468483dc
font_02_sfnt_off00010a9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9D 17336 bytes
SHA-256: 814592115d46e2641ca36883bfe6b445b364621d2151bfba5e1b5e8bbe912f96

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