Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6b27dda85e2dfc…

MALICIOUS

PDF

73.6 KB Created: 2021-09-05 07:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0af777afe173941f67c7b48f8f7775c1 SHA-1: 85a919f6124ef5db5adaa4d337372e7078825180 SHA-256: bb6b27dda85e2dfccf48916bcdae67e0649f51db85335482b2681a8b0241e710
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Additionally, the document features a link farm with numerous external URLs, many hosted on compromised WordPress sites, suggesting an attempt to lead users to malicious or phishing destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://dagvandearchitectuur.be/_files/file/bexopiwoze.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/655811575a90427180b8bba2e130695b/pipalopujiboganamo.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/96410845061.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/wonuxerenakepo.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e34139b5f---25568366479.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6037bcd7---nonuvitajo.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/21464088524.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a5093f9b3---jubatofefofekivarigeb.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202185111792100.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/wutizutidileterigenut.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/df38eftvfnqig936aj3brkepnq/vizajukexekitex.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/vebafomuna.pdfIn PDF document text
    • https://cooperspick.com/files/74768358942.pdfIn PDF document text
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/l8aeq13igt5dbsefoe8nqdo7kr/vabewiwut.pdfIn PDF document text
    • http://rayanchem.com/d/files/ranamodufuxumusobanumod.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/42797470954.pdfIn PDF document text
    • https://kaisar168.com/contents//files/37665569837.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/me785llld5p7rajgp57v52r6tc/50037086545.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe9622706---jujotakurusokagemuni.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e52762a6d4e---wobukupemikemag.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/420c2de7ecf77780e0644cdaf0fd4da8/bifetobepiwaninizafisivon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=attestation+de+prise+en+charge+parentale+visa+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_off0000ba35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA35 10944 bytes
SHA-256: 1a01f78f248ae8cb72c230b34ede288464ac8699f5d1180978a40be5d78a1509
font_01_sfnt_off0000d35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 18152 bytes
SHA-256: d89a313f08368f0a4297b5a4afaaec3d1dde46481f174b699ff77fd304018f02

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