Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbaa7a1699e775d…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 02:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 37905d61a85fab0a6ecdcfb05b01b4e7 SHA-1: d36ff04f9938697a49d8c70c8d8388c9c1ac3ca3 SHA-256: 7bbaa7a1699e775db904b673ccc66ec5a7120f7721365d7853d7c444ee076bdf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to websites that appear to be compromised CMS uploads, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://box8websites.com/ckfinder/userfiles/files/tofaliwaji.pdf In PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/tizuzufufomipewexepu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982e304e328---gelige.pdfIn PDF document text
    • https://andhimazhai.com/images/files/71459898095.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2f4e9915d---48824886649.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/d4f56c3b01e7eb9c7c0c0f8a870699f6/rojesi.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/2b6f2eae9de905c9862888db6cef3916/totemopopuwesawe.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/dirufezuz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/h981guluul8g2u91ja47apvujj/xatulirutapitawij.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/gdo912ot299i4ltgddq2v1gsis/xuzuri.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/govaxogajebuko.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/sobajokipobumijinokosol.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/sisabenojefu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rne9tu2sovcmbf9m013nf7m1ih/murixojenunolakij.pdfIn PDF document text
    • http://elitk.ru/_files/gasuxupukewipokurukolad.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/bederos.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/cc1296e35iblucv37qon8krrfn/jonejejozaludilelezijag.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/jidazasinumisa.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/425b4b7361956a7f1f61556de42970b5/fotorujojubajomox.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/94653913929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=all+living+and+nonliving+things+in+an+environmentPDF 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_off0000cea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA0 10740 bytes
SHA-256: c8e988ad48d3d295ac7335011fd91b74bdf8e6e09ca7b5541620e194ebdc4713
font_01_sfnt_off0000e6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 17612 bytes
SHA-256: 0e76a9cb5dd241fa6d946188cf4a9f20a66ddbbc55aa146f1bda8c7d35c856ce

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