Malicious PDF — malware analysis report

Static analysis result for SHA-256 483008733b0ef5b9…

MALICIOUS

PDF

87.3 KB Created: 2021-06-17 05:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cea4b9af21404a3c6e82d4655836f031 SHA-1: 7de39b3c120fe3744a70b1b83ef3dbc899feb9fc SHA-256: 483008733b0ef5b96b33e8afcc665a7cdffe2158caef4b18327eec2302e9520a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, indicated by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic. It contains numerous links pointing to compromised websites, likely intended to host malicious payloads disguised as archives. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan. The presence of embedded URLs and the link farm structure suggest an attempt to trick users into downloading a password-protected file, which is a common tactic to bypass security gateways.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://cructi.ru/uplcv?utm_term=joanna+newsom+divers+rar
    • http://notarbrazda.cz/userfiles/file/18713766091.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fb05d7f8---famadafam.pdf
    • https://andrejc.si/files/file/lululorejutulo.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbffec9e5---68335313341.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52e3e9571---disunajufaretesewifukurog.pdf
    • http://xycrusher.com/d/files/78401817162.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae06dc022a---padelawurifotesaxof.pdf
    • https://exporoaster.com/app/webroot/files/images/pages/files/dosemu.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e287655fb---xopuvibusuxumebi.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0f69deceafd0e4cd407b1773e7ac6514/2388378193.pdf
    • http://apvn.info/userfiles/file/47791297755.pdf
    • https://nhanloc.net/userfiles/file/gerivununo.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdce06d68d---nemiwegebarisunenefuti.pdf
    • https://atlastoursntravels.com/userfiles/file/24807546262.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/gcu7n3m8e9786sq54f2hq4523e/xuzeruvi.pdf
    • https://vieclambaohiem24h.com/upload/files/26417855624.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a98c9d82874---fogowe.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f67b719000---62438785165.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011588.bin
a2b0f035a34030050853e25399a82331a71d01d15334e1be67919dbe70d1a377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 5080 bytes
font_01_sfnt_off000126cd.bin
85841984acdb4871d56faf138c0e03da049c57f08c03359816831fd52b049f5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 12200 bytes

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