Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b345e3b719ad01…

MALICIOUS

PDF

84.0 KB Created: 2021-07-08 00:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0b0a7957e1b0a7ad4bf66f5409f0d17 SHA-1: 8a6ff7e5e33a27ebadbcbfd0c8b18c12f3cf3599 SHA-256: 24b345e3b719ad01bb76047432abd59091bee811a12bce390a8cdd698ce77476
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=micro+and+macro+nutrients
    • https://roweryelectra.pl/app/webroot/uploads/file/1621537925715.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bgls5jasb4iurcqqn0gl4cj02m/59170352736.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3a418548c3e2315636a3c2ce6dec4334/rawulat.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f214f67b---68973117600.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/eef3b37500d11de6aba885e509d687de/60988257877.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/gasozofeganoj.pdf
    • http://www.deopendeur.org/imgUser/file/85165590794.pdf
    • https://asiarsolutions.com/userfiles/file/82556698756.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ab95392cf034ac3aaf8ca160f4192421/rokorobukeba.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/844fa39e860fb8f95519225edc1721f5/lajegojegulipajemuru.pdf
    • http://dajuicebarus.com/uploads/files/kojedan.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ap5aejon91g7fvcrkgglisf71/46445365815.pdf
    • http://posekatzahradu.cz/files/file/1343559076.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf92b948815---87547211487.pdf
    • http://benthanhsgfarm.net/images/uploads/files/60393036671.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160819bb2c78c5---978352869.pdf
    • https://lesura.net/userfiles/file/37368894586.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f19b657b---89075064893.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/if7plrjt062sq7tmlgp4pftu6f/kixitetewivulakojojamima.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aff2bb7f8f---60811160204.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7f0be9df0---98741936916.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0aeb45f4---12219932070.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e573.bin
d83d02554351c17e7bd8f003774dbc987c215de72286d7ae308ef8f387a610cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE573 16848 bytes
font_01_sfnt_off00011142.bin
2db5c0f59fbd386ca1d4fd62283049f31ca2087c429f4efe55e9167cd5babc70
pdf-font-stream PDF embedded font (sfnt) at offset 0x11142 10576 bytes
font_02_sfnt_off0001296f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1296F 16792 bytes