Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b099c0c654b98ba…

MALICIOUS

PDF

87.1 KB Created: 2021-08-03 12:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 75c7fecb63f7b3f66c386febbfbd013f SHA-1: ac96b6336ec50780169def0d78a0d278ed187c3b SHA-256: 4b099c0c654b98bacd650c7db58cda55f0667bfb37188c8d3e453215c033a01a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fd59138a7---wurabedamibudatogorufub.pdf In PDF document text
    • https://pharma-tools.eu/galeria/file/43916186865.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606d62b9e0158---jipodivifonimabuzifepek.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210626235251.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/kujagadobabon.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210629180618.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/xupojitituxifugodarem.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107544c5f702---24665604941.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/dumugodutagik.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d953bfd4cc3---53723016610.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/76144153241.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/jbqk87pkf7f0fpd9u3je31gtj2/82861415743.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/03afac08735ebea5aac91e9de5ec2db6/xuzekenurusonifategomi.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d2b5e293---rixudoxado.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/buredinobaxasaf.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/lamobesa.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/93223319946.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/sesopuwo.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/78166435258.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/4965315332.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16085974a14468---narinebuzuripisifek.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/30223532678.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/08b96960ce6b3700ce0c1a6c411c64a7/xigowugugegukewawitiwibu.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072a14163097---foluvavutufako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=call+id+faker+mod+apk+downloadPDF 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_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 10604 bytes
SHA-256: 1cd2ed8e817e8363ab7b4450cb00238e726dd6c2fa5bf19cd00b2efaa7c690c0
font_01_sfnt_off000107ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107BA 17288 bytes
SHA-256: 03672fc8962b7b422125141803b7417bad1356fef0e02e90efedf279f397e004
font_02_sfnt_off0001354b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1