Malicious PDF — malware analysis report

Static analysis result for SHA-256 891dba3cead58afc…

MALICIOUS

PDF

89.8 KB Created: 2021-09-03 14:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1995144e9fe27654e8ec0c9ce7f01d91 SHA-1: 5c882e9796bc4ebfb0ff45ab08bb8afea5c82b16 SHA-256: 891dba3cead58afc1293e60083b8f638720eb6b00770252deb95a0440c997c5f
304 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal User Data

This PDF document exhibits multiple high-risk lures, including requests for recovery secrets and MFA confirmation, strongly suggesting a phishing or credential harvesting campaign. The presence of numerous external URLs, many pointing to compromised CMS uploads or link farms, indicates a distribution infrastructure designed to host and serve malicious payloads. While no scripts were directly extracted, the overall pattern and ClamAV detection point to a malicious PDF designed to trick users into revealing sensitive information or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=download+form+16a+pdf+converter+utility+1.4+l PDF link annotation
    • http://irina-beha.com/ckfinder/userfiles/files/savumexasalokenelibakube.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/99124921503.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/d97a599ab04aab4ee59a6aaad0b9ea33/71199523736.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160763add5471f---94672967248.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609482219edb5---27119817666.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/ac1d1b1074c435e4d355050866fb4f13/loner.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7b43003ce366e08a39c63f4e10698b03/54650594941.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/pigekuxerenitafomodo.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/xowawebipov.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3823399b8---kodupetivopigabopatomux.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/367540403.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/geq3e7f6f4vvjv97jg9938sef0/40480755223.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/fopulowimubugij.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/20055947762.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609daa18dd284---kezafajawan.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a40374c4ebb---3910919491.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/99833604235.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/41770283081.pdfIn PDF document text
    • http://amdind.com/userfiles/file/59816052480.pdfIn PDF document text
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/nefoxi.pdfIn PDF document text
    • http://yejida.com/userfiles/file/dezumelerus.pdfIn PDF document text
    • http://dzbnf.com/upload/file///komitodidivitulo.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_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001124e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124E 17148 bytes
SHA-256: c234ff2afa2284a67981726b5a386646a5421ba6a061148fd4a0c60c85f032c5
font_02_sfnt_off00013ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED2 11344 bytes
SHA-256: 147062086b1c63dc865e3ecb965ab28cdc535ee4f7272cad4da3f5046fe40584

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