Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5519276dd87662…

MALICIOUS

PDF

91.7 KB Created: 2021-08-25 06:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5437abdc42d066aa772d5d56182b0d7 SHA-1: b9fa8e49162f3876c5f91c9f62db61c377c356c2 SHA-256: 2d5519276dd87662f4442ee9133dc9e1c56365249b1bc365052ceebf66c70a80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites and disposable domains, suggesting it's used to redirect users to malicious content. The presence of numerous external URIs and the nature of the hosting point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=product+mix+meaning PDF link annotation
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8bda284728ca8d4eb141b937d4aaa797/lewewunixuforevojesinubal.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/padigejaxina.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/zowomiwa.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f013d4a00fee7de2f455a8c800f8576a/negadugukawi.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/s1qvtsr98qufi95qsk5f85bhp8/gumuzu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e9004749714---dupepukijinugomapomovulug.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/u9on5c7d1fd2ijdrnnqu4o9a97/dosoderiroramufora.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0765d879f9---25466941438.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/vugaxoxijox.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xotupefodefetajesojax.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161138ddd13518---lijofimiwejazi.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/24253622407.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/54109641794.pdfIn PDF document text
    • https://premium-house.uz/images/file/derafuto.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5c4bc3688fc9e6d909175b6382ce35e9/34833667370.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bc16ce916481f72e007ed9a1ea8ff47f/wodavineke.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c7b52c11d19fb11de3de645ced751918/xapogagifituxi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffd6193002---9283125275.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/16043489220.pdfIn PDF document text
    • http://citranco.com/users/files/10459055726.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/tuwanus.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7a2a0eea---83117060501.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/35322518299.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/leleranofuzavaxikulowaxu.pdfIn PDF document text
    • 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_off00010294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAB 10704 bytes
SHA-256: 1e2536d095900ca49a21d433573e4bf639b0b5247c2e6711015dc9a6667935c7
font_02_sfnt_off00013306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13306 17652 bytes
SHA-256: d5a85b1d2d0df4bf5d4c607857d82895652709e81abdc7cab0b1f17ae657e255

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