Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ef149c23bd4819…

MALICIOUS

PDF

87.3 KB Created: 2021-08-28 21:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17c1146620f5a5ed69fefa12aa5ec5e2 SHA-1: 42deae9f1e06ef13147938d1c4657b42e613f7e8 SHA-256: 91ef149c23bd4819b32671be59485a565b760b2a17e3ad03be5a0d5f572840b2
164 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting it's used for phishing or to deliver a second-stage payload. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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 http://silver1979.com/upload/file/13472697859.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/0e80e356446c807c6c68e5cda2b3bf51/89830969467.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd14472e24---pegekamobez.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/49735156346.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e204c402ee---98660028541.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/10444600176099138d06812.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/tebemetubuw.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/nurinisugenuzumuralirifa.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/jibedekoj.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/83545624716.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1to675thke5dj6l2pa0vi9paij/38091747635.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/04536ac06b0a7e3827ab03a146f7e6f5.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210728082551.pdfIn PDF document text
    • http://secretinvitation.net/images/files/nuzofozelubuwumuvilujodo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b911807aa---97517097543.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/add1h1bvjlvc34uro8jltra42d/74358649813.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/32429253089.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/70629557344.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/44af2d8cd7d6de1af4680bba790f51f1/rosiv.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/idjmp1ldk9uqf9kn4479cvcd4e/dimepopakikudu.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/vusedatorusexuk.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202105250909530005.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/fagixebojewoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=ultrasound+machine+buttons+and+functionsPDF 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_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 10988 bytes
SHA-256: 3ef8a748e7f677e2754a69d9bf187d182d9d7429eb35eea05b758876bff3067e
font_01_sfnt_off00010877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10877 18516 bytes
SHA-256: 1ec7e7295533237ba2f809f9162397b69d3d7967b12ddcda92ad987edf07f883
font_02_sfnt_off00013730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13730 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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