Malicious PDF — malware analysis report

Static analysis result for SHA-256 a87f8b0a68f5e92a…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 01:31:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30f22537d8ab3630d707eb8755d035f3 SHA-1: fa10d8a16419a836e26494a8f74a1fc816182272 SHA-256: a87f8b0a68f5e92ac3b70468b33d1991c8bae9bb7011f33fa830fbc63f6fca83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://pozitron-s.ru/userfiles/file/lidutezafitobikas.pdf In PDF document text
    • https://solelane.com/ckfinder/userfiles/files/jabikulejo.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/tolunasasebukowategasit.pdfIn PDF document text
    • http://fitviewer.biz/files/file/67619854790.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c3ffd31ca---ruxepegozov.pdfIn PDF document text
    • https://fcr-fomentoconsumoerenda.com/uploads/files/rowivakusiwavuram.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde9c06257---61496560011.pdfIn PDF document text
    • http://charivne.info/images/file/32260246131.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/82806854595.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/b18e8223e160a7389456e89688e01e6b/19559149461.pdfIn PDF document text
    • http://szwygs.com/upload/jurifogogaruzezi.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/kojor.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0436e834284142d6771efe468fb6195b/98573971401.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/desanegi.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/20362660631.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/dimejubusefuxotuxadepif.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/21543546124.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/viresarokupazo.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/kekefu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/jofixipomam.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/jntn4c5n1sat5uraqo2gjsdqjr/zalonudugati.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a58b6978d24---77472089504.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a9c1cee04---zusufetuganekuwobenexu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609958435a21d---wekadimep.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/49116b86d83429df2da8f1076687eb2d/82766323629.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/89509468927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=fulgor+milano+stove+manualPDF 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_off0000b54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD60 17744 bytes
SHA-256: da5a9a14ea5684fe0a6447801a0d07dfbe4f46fdfb5f9a94709a80f574d7d5f8
font_02_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 10596 bytes
SHA-256: 1e0744d01b87c69371c708afadbd39f47f834bd74d7edc3b4077c8e98ee412eb