Malicious PDF — malware analysis report

Static analysis result for SHA-256 96431fe40b96af42…

MALICIOUS

PDF

81.2 KB Created: 2021-08-30 17:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e23b7041a790c032f1736e3e16f40c94 SHA-1: 98a002b05c3829baee51310073666b18d9cf17d9 SHA-256: 96431fe40b96af42b8492cc7dc5b012283a6f3809d460621033067def44e0fb4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning model and ClamAV as malicious, indicating it likely contains a malicious payload. The presence of numerous links pointing to compromised CMS uploads and disposable hosting, combined with the 'SE_PASSWORD_ARCHIVE_LURE' heuristic, suggests a phishing attempt to trick users into downloading an archive, possibly password-protected to evade initial scanning. The document body was unreadable, preventing a more specific analysis of the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee0a83ff3d---53162896681.pdf In PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/23432479869.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/li3kjf8neutu30bshpjvffr4ki/rugot.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/nexibidu.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/74810532558.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/wekalumi.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/43060593430.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/guzebeluzegamaxedoxu.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f7b5b6d2b772e8eb762289b72696bcd3/19032046471.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080200bd71e1---jatedopalaranoviwu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/aq67h8khn91m8ndrfhehbtvm0l/7037864549.pdfIn PDF document text
    • https://breedlife.com/upload/files/fomineka.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca49482646---gupewazibil.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/7830aa61533e6b30e7e48fb9a17123b2/zokedu.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/97781286943.pdfIn PDF document text
    • https://gilbertems.com/videos/file/74500692586.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/98544494932.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/nukopi.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/89065820926.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c7ac16ace---96987277818.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e02ae3e5b9ff7c3e77d706c3ac6ac6b9/79258734075.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/14af13856f65b0d25bbc1ef739cbbad5/zevepozuwibofokoka.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/puzopagewuve.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/womozed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=non+starchy+vegetables+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_off0000d7e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E1 17436 bytes
SHA-256: b0a3d29e3ed2b14703c05ff744661c1f40bb539f2dcfab881c92776f47c57ccb
font_01_sfnt_off00010503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 11104 bytes
SHA-256: 4f04f2437e28ef3084c5a3df21ec53cb4aabe3a387ee4127dbd2d6735cc9eb17
font_02_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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