Malicious PDF — malware analysis report

Static analysis result for SHA-256 509ea24d57f8fde3…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 21:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ce2f9375f77f05f0afb50c54c49064e8 SHA-1: 59251959d6cd65df8b0608efd77ace98495d328e SHA-256: 509ea24d57f8fde3697b21f2c246764cbdf4d769cbc429889147be4efdf4a0b7
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=10+best+offline+games+for+android PDF link annotation
    • http://kimyasaldubeller.com/upload/ckfinder/files/72803657672.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613856f3422ca---zijura.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/wakofagat.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/zewaxelezemowelodi.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/zapivofosetadirakilare.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/78464210459.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/94490304372.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109070627185180.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/dubizapez.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/zakijirajovu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133973899eb5---xekikapetegujafusaguwud.pdfIn PDF document text
    • https://jogamiskolc.hu/ckfinder/userfiles/files/kerujudodo.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad2d40034---bavemidegawupuvonimex.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/61865518568.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131ac52ce093---93915611468.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161435ed40f66b---16625746134.pdfIn PDF document text
    • http://turatabor.hu/media/ketilunuvarawokafalajope.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/sefozusijote.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/32326738137.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ca07bece---7985593878.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/sunapuw.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/85560733704.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfd7f64176---99411281100.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/67659125584.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/zabolevekojagerokigixebuv.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_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 16664 bytes
SHA-256: 324f1bf69516f224df9c61f3fc9fa8615fb3f8ef9dd6e709b45bcb62ec9cfee1
font_01_sfnt_off00011da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BB 10916 bytes
SHA-256: 69d78aee800857523b6296bbab99cc304296f942b004809218c5b8f62e0c2073

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