Malicious PDF — malware analysis report

Static analysis result for SHA-256 18779883451419b3…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 20:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b711a866aedc46f7acf266ce8cc9af4f SHA-1: 602f36fe376d91b8205dace41e2fbc8a2a2832ca SHA-256: 18779883451419b36e0e5b733852eb55e99f6f68124637854532d66b9529c7da
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution point. It contains numerous external URIs pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://allytemp.ru/uplcv?utm_term=good+words+to+describe+someone+that+start+with+n PDF link annotation
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e8c4d4a7922b4dd612f778f94644bb92/83975907073.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/3015223109.pdfIn PDF document text
    • https://dom-titan.rs/files/17429476292.pdfIn PDF document text
    • https://sjaindonesia.com/sitefiles/file/dekimuwopusot.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332505038f9---kesuxadenagakaja.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/8764012625.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/40682169945.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/degavesed.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/4219146231.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1845a12e2---vaborokar.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/gegamido.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140f42e284b6---winogikatajug.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8e1f236b7---1351766184.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614491647c11c---tozumowiw.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/xenosipizatuvuxigidesom.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161443a2ebe2a9---86921750673.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/64136759501.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16141bc44d0c8f---71085858493.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/pibavanewopi.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/kudowerom.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/21cef03f1e3081647b4f0377f520b771/nozagazerifelif.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/xemesimuretezijakem.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_off0000b27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27F 16352 bytes
SHA-256: f07ad377d7c9994ab9916960868140db240fdb69eedeeb1745e963081386924a
font_01_sfnt_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10852 bytes
SHA-256: aa8042e52ff567a983613ef59e71bd75dd82c22c34aa7859f0cf74e6dd126035