Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a5ad9f54efbbb01…

MALICIOUS

PDF

74.2 KB Created: 2021-06-21 16:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3ca0512a3cb7cf7a83f42444c619e1d3 SHA-1: f8d2e9ac37a7b37872bc3f24e1514376aaeef82a SHA-256: 3a5ad9f54efbbb014bad8d368b707bfb0c58e5a05ef5d50e4194bc294173d726
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content or further stages of an attack. The presence of multiple distinct hosts and link farms indicates a deliberate effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/ono9pdg8pubjp7tqrtbkl6dkqg/mosetitipipozajirefa.pdf In PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c886a411cc---14771971798.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o3hiknen29ct0jds0pu0k1hbsq/95107117054.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/97c2cd40c047bcf75294157a2736dd42/4236805839.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/sidiki.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/68530496169.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/usa6k9j13upsbjdl1bc18gqo27/kexisolumader.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/53604173727.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087226a6789c---wutasuxadobexidax.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/36462071257.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d1c72cd7---58214215581.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/zuxevilawaverenuxojuk.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/48853508686.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/80326997796.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c7cbb0861---jovidabufirorutatejade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=adding+by+10+worksheetsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84b261aaf3---6464943291.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 5212 bytes
SHA-256: 7402cb7f4a12ac80c491efa41d4dfd2f6964637f8782f9dc7074a86cee508ca6
font_01_sfnt_off0000e824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 10572 bytes
SHA-256: 7547077a3af727b792beb9703cd15cfc04c2c4933235deca2d8257d8bd135d6d
font_02_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2