Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4abd7858e1b035…

MALICIOUS

PDF

80.2 KB Created: 2021-06-26 15:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 743267f844905152c9314ba5433f3769 SHA-1: 05c4616a295423885a1e3727f2f7d97e93c76d49 SHA-256: ce4abd7858e1b035d025c6a96f482b021adce427d1bfdd05253d8ef91589263c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4457be26a0.pdf In PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cff599f6aef3d9ef42d0295e161ba4ca/56943664918.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/jorogeradugo.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/jogumunuwizagoti.pdfIn PDF document text
    • http://abnicum.com/files/file/rivafuwajozimowoko.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/43662484606.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/gebibawurefomarunujijolak.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f0e51e733---42484858636.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/65895047338.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/6017c659be32e1d0ea82295c67fbe2ff/wanorotebapisorikobenono.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64c2e59ecf---niguganozadotewoja.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/taravakij.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/832100716.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/1chiujtfa00bbpbec28v636jai/pabuveba.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffe00d51fd---21534154489.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/19112531745.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/neranofiwuniras.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ebeacb8d41dca7267567d241764d1707/5723182739.pdfIn PDF document text
    • http://12shio5.com/contents//files/41904435714.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/23459778413.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/84763819240.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/vn65nqlm50muft55vu2opj4i7t/magan.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/nadatusonewoxokijuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=influence+line+for+cantilever+beamPDF 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_off0000d3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F7 10584 bytes
SHA-256: 59c708b67cc4e74380a6070062c300aef1caebc801c7c07796384a4a7c436723
font_01_sfnt_off0000ec1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1D 17384 bytes
SHA-256: d2dd97f70377f72b72e9a05875b5e19abda140e1338ba2ad1b3b4b0e7f9d9764
font_02_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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