Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b49c3cc62ae511c…

MALICIOUS

PDF

111.7 KB Created: 2021-07-01 00:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 687b46f03a6ab9205dc49588cca7a6e7 SHA-1: ace6f6a01f3f0684b50e63b411da121d7cf5cb24 SHA-256: 0b49c3cc62ae511c5c268ed357d2704650c55588af09ba3bb266c35ee4b20f9e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection, indicating malicious intent. The heuristics identify it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous embedded URLs, many hosted on potentially compromised or disposable domains, reinforces this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://aawyx.com/sites/default/imageuser/file/2017948949.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160928e03c7fef---jubiwajusugoribakiz.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c42a5e356cb---sakijeraju.pdf
    • https://indobaliart.com/sitefiles/file/7808124483.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735226941f7---puposa.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qsv12a50d59m3mbj8dm08o2614/83849228666.pdf
    • http://fitviewer.de/files/file/kasekemofexak.pdf
    • http://pwmtqatar.net/userfiles/file/68844954982.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2805c80f06---pipul.pdf
    • http://www.companyforte.com/imagenes/editor/file/levikuko.pdf
    • http://andlupa.com/userfiles/file/96979628538.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f21124c2f---71949851814.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd48514109---1045023996.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088187ad79eb---39359295087.pdf
    • https://argumentua.com/i/file/45247409929.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/25876f32981b41f34000a09e8fac39c0/gegiwovovaguwofatusola.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607b000030060---47597303856.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608de899ac967---49754154879.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/f5510psoe124ll9hejj60hqut2/bozavaroravesaperafukog.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607726f6ac32e---nezinofovavabed.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609518aa83e29---67934916476.pdf
    • https://volgogradexpo.ru/ckfinder/userfiles/files/xijifemadijeritaroket.pdf
    • https://beldaoyun.com/calisma2/files/uploads/takuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=places+to+see+in+cape+may
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015536.bin
41f9d10ec49c629a454734d05dfb43e00b14b06f122b479fd7b03df0326ca95a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15536 10548 bytes
font_01_sfnt_off00016d47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D47 16792 bytes
font_02_sfnt_off00018559.bin
54d86b103a5bf48a9d5529d6bce12fd9680086724ff8e9098f51df8487ac9a14
pdf-font-stream PDF embedded font (sfnt) at offset 0x18559 16916 bytes