Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea829f37dc9bc343…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 09:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5e39b02832ccec567de7a30ab65a66f4 SHA-1: e7bee05f8c6dae7aa0becd31f0afd05b5eb9e327 SHA-256: ea829f37dc9bc343dbe4d6ab9862f52e2e79525df6072ce0066b2070c9844939
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting domains, a common technique for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs suggests a broad attempt to lure users to potentially compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://thanhnienxp.com/vietkiendo/upload/file/sidopunidinavoxududonu.pdf In PDF document text
    • http://hardiebase.com/uploads/assets/filefile/gexogawonifa.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/kitanorizakazavisepirexov.pdfIn PDF document text
    • http://synfarm.com/upload/files/metil.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/33171529258.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614059967247f---bibelasototovofuravuj.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/51881570549.pdfIn PDF document text
    • http://eksternest.be/images/file/gekirafekijofel.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/15021719331.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/gojumo.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/g0vgjks9f3kr1songt8j1cr2cr/41999258663.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161456764e054c---wolezomadokizipede.pdfIn PDF document text
    • http://rts-3.ru/upload/files/vinitopudifumazavida.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109160827275868.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8ff5782a049836a740462a6c51aa5202/66978845732.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f705c28cf6---wewedutubelowupupipeba.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/zejatunutofuk.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea9305168---70611277700.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210916_D0D8D8D1B4114451.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/33076769021.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210909105922.pdfIn PDF document text
    • https://kildevangen.dk/files/86612152032.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/40788680853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=instagram+link+apkPDF 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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 18016 bytes
SHA-256: 11d75a6a403ee45f48c94f048e808ff1577f9e045440de3ded7c9c0f1f992109
font_02_sfnt_off00011b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B37 10388 bytes
SHA-256: 18140d9ac4fb79c327934e04cb1bc35091dc5e8c78df8a948b246d3342158106