Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bdc94bea6712fcf…

MALICIOUS

PDF

99.0 KB Created: 2021-07-06 14:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 48813293e09a86929ed768e4e7d50aed SHA-1: c33ddec6fa9122c242f036bfed37312e7ce4756c SHA-256: 2bdc94bea6712fcf71b5c3ea39e700b7174ccf9083b4e3c8ebee223461900651
164 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a PDF file containing embedded JavaScript, which is a common technique for exploiting vulnerabilities and delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of the listed URLs, many of which point to compromised WordPress sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b89e5f211a2---24966989429.pdf In PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160942ece566ef---42391866454.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/fsupamqm5drvik9rtuofgg33ng/78356174493.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080fbd272642---65443239298.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/dso8l1991c6ofbp118o4pn4g33/93708473401.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/22507289464.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/3597333686.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/newabetabipovujagaju.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/c0efaf13b6cfa82cf21137c0e7a18506/96651567271.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/62279717819.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/liteg.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/f54hnsg6p6a9ubaekkknoev58h/74178352003.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/kaludaxubivowazas.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec95577846---liduwinojus.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/13050354950.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/64c567f2cb84eed264a9acb0901f435b/seliget.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/93c6ee00e02d8c1e856b9006e1a4913b/57984854731.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/85566817815.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/dagafirowivobijogefa.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f7aa85e8---95724141633.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c881a787730---50293597335.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/putugateteguwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=to+lead+the+way+for+others+meaningPDF 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_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13459 18600 bytes
SHA-256: 9196df1f37afce7ed1a0ac4d98ff203e2e96842474b7a7baab10989ad58c717e
font_02_sfnt_off000165c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C1 10964 bytes
SHA-256: ab01d3fb08d7be6b202dbace8f1f5a4a996222e3a0c0f2cda13e67f2af4a393a

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