Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b7e319ac988465…

MALICIOUS

PDF

90.3 KB Created: 2021-08-10 01:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7fa83c2af0d8e318d346ee93673e2edb SHA-1: b7ab77d720b36428162d1346226d804c0c1558da SHA-256: e6b7e319ac988465a30d598bf058f4c53bff07ceb14e7d8ebd5cd998c70947d2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db0d7455ed---98502795409.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0b187bdba593fd9e26f3536898649359/vemumekumejipixiz.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/meburixokixuzatoliruj.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d76f1e6af11aca239e915ece99abe7bf/voxadizadakagaraboxebi.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/torekevegitusana.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/55567fa400ce22e00d6c308a980e22b3/jezadufudinuzukajib.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea9a66555---podikuzopusele.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160823b3e8eb0a---25564595070.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/4fc553e027c6fd209257e8b38eb4ccec/74116376615.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/fivofiritaguf.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pnuh2ka5tktsdk27rnghtdc59s/jivodamotafap.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/xuxokinenugakukamawezaga.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/5vnnll7ve6o27c5pje853elpk3/pususifuxufalatizup.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/ramosowarevek.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aae2efb1c83---zozaretefaziwuz.pdfIn PDF document text
    • http://12shio5.com/contents//files/kegive.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/22252539022.pdfIn PDF document text
    • https://europartner2.pl/uploads/kalinolenileginelekebiwis.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/2306996856.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/66608877940.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/8051107612.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4fd145799---fenepetarinapixupitoniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=what+are+the+most+common+sentence+errorsPDF 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_off0000fff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF5 10348 bytes
SHA-256: d9593b11e2e65db5779c2383fcb1f522fc6b785453bbe22736e481188cebc812
font_01_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 16996 bytes
SHA-256: a314fd484d428ecca6a30914abba0835a3bfabb1e53b4066b671332c397b1eaa
font_02_sfnt_off000143c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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