Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b588b290a0a6e2…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 18:11:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 285ca4373bac0b5b708787ce8a20fef6 SHA-1: f54bc544314a50d15827152df684ec29ff4a6380 SHA-256: 16b588b290a0a6e2fa3395651fac31b0b8b71337548c5a39461b85baa5090f09
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. The presence of external URI and link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6ba61cf21e1c180bf395048cbecc411f/maliriliw.pdf In PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/xexisikividudavofanazur.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1887d6941---refufareg.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/b671a1222011abe17a645ced87025d4b/60602422673.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/molapuvajixi.pdfIn PDF document text
    • http://erpos.sk/data/files/pinoroxivalukupexuluzosu.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/97a90fd3412baf7f7400d4f44abe06bd/finizejekadakoda.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/88073831910.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/wipafofuteriw.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4404ab86d294901496485037e0622b80/56405463058.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/xigegunesubexakogazibud.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/6066038639.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c9e0029f6---tufiwolotuziman.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609646d4be939---mozebojib.pdfIn PDF document text
    • https://tmtteks.com/files/4325476412.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/19805025657.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/nugabolin.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/nexitokumanigokif.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c9b9bee7e0d042900006f5507d23ff01/tabojagukifapunuguxiwogi.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/ranuwewebowinuxogigo.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611bae9b8ee63---30227436104.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/pikemonatupalugapovozamum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+the+plural+of+monkeyPDF 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_off0000c96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 10920 bytes
SHA-256: 68ed863867e6cebf04553a22d7b8c2e13c44141de1ab0c16aea7dbe91a7aea08
font_02_sfnt_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 19124 bytes
SHA-256: a0fbcfb2ab820b69a3c6f9774d41a6182615e5319b6c8766e9b85d15f224e042

Open this report in the interactive analyzer, or submit your own file for analysis.