Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e1816b3325dd21…

MALICIOUS

PDF

74.7 KB Created: 2021-06-23 04:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 550c9c65e1228a10862d9774f52265da SHA-1: a7d206287cba8de5b4e0fb4cc45b6c20f6029223 SHA-256: f0e1816b3325dd21c75c01fe02c3fd23e5afa78e490ee01591ec02afe19c0d44
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous links to external sites, many of which are hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document actively requests sensitive information such as private keys or backup codes, directly aligning with a social engineering attack. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://crysiq.ru/uplcv?utm_term=how+to+configure+radius+server+on+windows+server+2012 PDF link annotation
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/q9e0ms833v3iq420gsjt899scu/tisifodefafon.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/gexuko.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b4de28cb3f052077c7af1fa5fa885488/zovibuzepatokowetu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f89f2e8bdb---witarojevifufowan.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/xaretazulajuvuxu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b9691e56---13051609822.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/wexifevakubekutogifogi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/lotosovonaxesevuxif.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93c779c8f4---galuvolokazebezetumejo.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/6e3a30135b527f6dc5996741cbea4f5f/visumobavikevabulut.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b306e6eb72e---95111213486.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/5042707464.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01639deec---fedabibemiburixoz.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/42012884744.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hiabgeehmg1o1ut57hpftp4pfq/42324481263.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/renuwikomejamopa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE672 5596 bytes
SHA-256: a1aeae5e7b353e2365d34abfaffee6a89133faf3acdf7a715a94c60bac0454a3
font_01_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 10440 bytes
SHA-256: 4380e83af1aa3b3eb408e8de5b1d4d27211cb7838742edad890794473c55aab0