Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e3377396a18358…

MALICIOUS

PDF

71.2 KB Created: 2021-06-14 12:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9016096263edd13575d5a14ef5c1d40 SHA-1: 991c508c716bae2a416d93362d30b7ef43abfd09 SHA-256: e2e3377396a183580bfef72a9252497139eabb06c465f476db3633a6d185f7b1
196 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The heuristic PDF_RANDOM_URL_LINK specifically points to a malicious PDF file hosted on a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=la+caba%25C3%25B1a+libro+completo+pdf+gratis
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607015eda3507---ratudelo.pdf
    • https://abe-rdc.com/userfiles/file/21165076917.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/d642200fa188f7c30c01af9b6def8b8d/migojivilufijigodanaweduf.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/a7mkmrcac1adeicl0u89jg2nut/41778922010.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0608fb1ab5---26651785783.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160976bd66d827---41263318118.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/0rrm580ffs11jvsrafe6b34ss0/11826196417.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/5aa10b2f9114fc1ed4df5331065ba16a/56148622682.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607337b73bd62---85503643619.pdf
    • http://thankschicken.com/uploads/files/28706480828.pdf
    • http://parkhigh65.com/clients/4970/File/sanosadugesuk.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/shpqaiuve8lat125rkfhhdjp55/xatagelupabifup.pdf
    • http://anthonyvienna.com/sites/default/files/file/69437949314.pdf
    • https://alutat.com/data/file/vemubovone.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8q2sn29ksvdo768n3t4e8ha1m0/nijerubapokav.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160773376a83fc---69846346623.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e054d2a694e2406e31fe361378f93681/34415317942.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1754f56e29d83b77a1084640303f159d/solibagamiduvefixasim.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33e3dc04b---sovesaxevikom.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_off0000d48b.bin
2648dbd28f5fb9590f2c7e7aeaeeeac306c1e6e477e4884ee92273e448426745
pdf-font-stream PDF embedded font (sfnt) at offset 0xD48B 5768 bytes
font_01_sfnt_off0000e7d6.bin
9ca881580222d411d057b40d9e36cf5ef300313c33620b4953835bdc2a53fc4a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D6 11704 bytes