Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4395a1d1e1ccf6…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 07:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 716a6110559faf683f26c7e88c44460e SHA-1: 3259e335215d8e45ffc3f2c7f061e314f57a0d86 SHA-256: ef4395a1d1e1ccf69b79774f43c486eeed2580a65b0a923b23cbdd87bb5182a4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection scheme. The ML classifier strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lead users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=how+to+facetime+android+to+iphone PDF link annotation
    • https://regiefranchet.fr/userfiles/files/80742683084.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/vonorisozelefiwimapedonaz.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1632340689.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/riginumiroletefafibadad.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/72530311299.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3104bb30---miwavosijijabuge.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/gezikavaxuroro.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/53946199680.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/soxixufizemilikox.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30713813037.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/12317468048.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109222114526587.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/vexerur.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/9855806f341a5ee3107c8803e94e9be8/pemafonubavuxefolekasipa.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161395c3132463---18547782331.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a126d0b286---vekomenuvapabumelorimuzuj.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/pedirisiragarixogonenudo.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/rutozasitis.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/tesuxagakominerute.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/94719090583.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/susakuwusexakomawevo.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/79431497474.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e71ec8592---25812181652.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf6db747ca---dewesenemalajiga.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_off0000b2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 10748 bytes
SHA-256: ca83501cab20fd477ce0768c3ada7deb821fe11c673d610f4844b23864cf5575
font_02_sfnt_off0000e389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE389 16188 bytes
SHA-256: f4332c2f101ee3cea556b48acdf4d3165adec00507705b10f79f421d63eb5c1b