Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5ab7abedf8fe5c…

MALICIOUS

PDF

101.9 KB Created: 2021-09-06 12:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: df7f8953ff8adbaf19634fed873caa27 SHA-1: 484271d1115f2ed4ae59ff55c676092b8ace32fe SHA-256: cb5ab7abedf8fe5c0011620234497463f90064b0d20b8dc2a5f35e4db30a5a59
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Heuristics indicate it is a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://vresponse.net/userfiles/file/26197917384.pdf In PDF document text
    • http://valdhans.cz/userfiles/file/26460060187.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/hd3f385gu5fqoih7psjjv237t8/86440596481.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9d11cd4d9---37603383055.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e74ae6675---31847123995.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/10087278153.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/de53ea258a4f2b1fe85760e59a7e067a/8226121494.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/07ff1eb7076c185ddbf674e73bf2ffb4/76865937109.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/zepaputerajaxetugirimux.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/86471185459.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091c971b19c0---12361689411.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/gifagesemedujibajofagew.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/40562784243.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/xinowapuj.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/98507012368.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210818/files/20210818193521.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/44256609242.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/foredozemutokiginitetime.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/42761463818.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/3041352835.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/zogijabigidalovon.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/xasuviwulepirudozudife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=budding+and+grafting+pdfPDF 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_off00012dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC7 17484 bytes
SHA-256: c9dc0b4cb911fd2cc8764f61a713719367d28ab4eb98a0d71290d6876984aa63
font_01_sfnt_off00015aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA8 10360 bytes
SHA-256: f1ed3e117d7f099001a3eb3f7ca6646d98bcf9db6cd3dcecd174a33af451367b
font_02_sfnt_off000171f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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