Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bb55bb602dc64a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-11 07:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: de21c450b0eeb53c65013f41c02d7443 SHA-1: 80710cc1d7a676d8dfc131c5fe23ff266423262f SHA-256: 59bb55bb602dc64af9c8b2e7a29f7fdc3ff80834c7d8710c224bc2361204be7f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the ultimate destination or evade detection. The presence of these links implies an intent to lead users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16135f17c4bcd6---xanojamige.pdf In PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/vevidowadupuvonifux.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/63561149793.pdfIn PDF document text
    • http://rnralpha.cz/res/file/gulosefadiruwixekimasune.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/rikudelone.pdfIn PDF document text
    • http://baove247.org/upload/files/4280971230.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1f79c6b8b---95841993134.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/towujinusavokavinonik.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4a8da6be292af05a94a98c8099b8cac2/sixopubivarubusizusorir.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/mufisiw.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/widixewuxanuzonogusejomu.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/10560561461395f264c6a5.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/15837345306.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/97298480353.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16135dca0e3a27---puxezifoforix.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/97739086578.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/xisaken.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/muredupube.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/tasubiwelarevaneboje.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/27221365405.pdfIn PDF document text
    • https://menu2uplus.com/images/file/befunalivikuni.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/difusotisukemetafulofixox.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/girarevimalixu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+go+joystick+hack+androidPDF 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_off0000d77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77E 11108 bytes
SHA-256: de2478f2ac3ee8a173e921f76bc4c05d26fcef4b2d0dd96a8ecfc919c198a213
font_01_sfnt_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 18112 bytes
SHA-256: f74c7d8665ca179435a063c0d6cb95fb71cbc14697ffc99b48cfd85259484758
font_02_sfnt_off00011fc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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