Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9e125879e18ab05…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 02:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7f5703ad6a28165e5fa6d9ff189ed066 SHA-1: a66397577067472c9973b952a8374506509681cb SHA-256: f9e125879e18ab050fc49a62cf1fa7b4f251b5bc5c6b553dc0cb9dde5240da6a
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://centrorevisionimonregalese.it/file/bunovesuwepo.pdf In PDF document text
    • http://suphammamnon.org/uploads/files/mesaxogevejo.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/19696722369.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/bozezoma.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/kbqdn8lj8a16focm5it5ib9c00/pazili.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/supamomipujiro.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/devamasevevul.pdfIn PDF document text
    • http://anpo.vn/upload/files/xevigixur.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/69257566522.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mufosugoxuvuna.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/wojexusawajukuzifezede.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/87789190583.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/22758960585.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/medazulaweje.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/13282486452.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461fde2a990---muvapimazagal.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/boxupanadanipijejugow.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/rewinavaxagabiwuxep.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/pagim.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6d050bc6---wurokemaxodet.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/52527049585.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/pobore.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/22288570809.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/putiwipageda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=positive+words+that+begin+with+the+letter+rPDF link annotation
    • 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_off0000b2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 15916 bytes
SHA-256: 574231278e00a8900f3f7ce5e9798d73595968c232a98e46a6df819f89a12eda
font_02_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 10820 bytes
SHA-256: 2aa07615adedeaf73323f9943e42eb618c8a4a88711e7a8d4994b89c03dc8b04

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