Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37948d63796c9dc…

MALICIOUS

PDF

83.3 KB Created: 2021-08-20 06:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5171d3d8fe94eb33ea8d0a7dee6dc47a SHA-1: 3940bbf5bb78bbde3982c843e1ad95688c8edd56 SHA-256: c37948d63796c9dc89363180ea75e7bc3b999bca16790d2ad1e4008f72d87e4f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely downloads and executes a second-stage payload from one of the numerous URLs found within the document, which are often hosted on compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://upoart.com/ckfinder/userfiles/files/1440127861.pdf In PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f53a15ef1---45284182348.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39a8648d9---85326513680.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/76339997189.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/87435c7d31bfda3f17a55d679e82949a/47586290754.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/vonogarifomi.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/29sc5fb23m7aq0kar4nu7cul56/dobivevokurutolug.pdfIn PDF document text
    • https://mashura.co/userfiles/files/taxefopewibabufukuru.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/31710780154.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/bodexitekudi.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d4b68abff28cffca5815e559a0082a3d/jofasesagobuwofurarubinil.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/78096f9bba347adbcb8240e5d0f3c8a9/49275760077.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/14952414371.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/kitokafexulobaseteruw.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/56b0vu8e1umi3538kqqa9hr594/nepifiwesanutupupi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160919ed40325f---sojif.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607676a4df538---51491678712.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca47a0ed04---91164935096.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xugamikavaforexij.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/4435e95f872ea2092d98435e35e9e7eb/wuviteganofituvovanon.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/lijiguzipola.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/pajidirawirogekamugin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+games+win+real+moneyPDF 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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC3 10748 bytes
SHA-256: 6f11d6c4634eaf93c9684a47ae78403aca5e503f5ac6e98064784d8347b6e861
font_02_sfnt_off0001135e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135E 16600 bytes
SHA-256: 8355cb27b54f4aa837c141f57ff6ca03067b0d6b40dc0f1a330552ede267927d

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