Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e7238c8d07f619c…

MALICIOUS

PDF

86.4 KB Created: 2021-06-12 19:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7e8f31cfcfa68610836aa8352646c8ad SHA-1: 6bff4bccbf1dbcc24e6b14ac5e0435ba3b78eca4 SHA-256: 9e7238c8d07f619cefc9812f2f299d4ad0b0ab64e9e2089bfa8939e4679ed1b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links are likely intended to redirect users to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 https://irlanc.ru/uplcv?utm_term=unseen+passage+for+class+1+english PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f233d86b1d---nejugebirowemolowi.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16096133b6e670---mitat.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/vexibexoka.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b9524354f---95873066171.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072c728298d4---savapiwibe.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16094437929c5f---dadakitugebafolepokodep.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/c29badc7de3c1466610ce464b4fbcfdc/92807445905.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wovoludilugobapavi.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/fexikenaxotipasagokik.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/14105225673.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/a4e0i9gmimj34ci3qtssehq7u1/2749487597.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/65bd7eac848c5b3b88810f30bdb754ff/bupitusaganapuxiwilawukok.pdfIn PDF document text
    • http://tulga.ru/editor/files/tologazex.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/75aed2c631f152d7e7cb6fcce5d32a09/fidojolojebamuk.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210608_0F4AF35827B616BE.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bfd4125802ba1e392f7fe4e731d77391/59757384583.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 5320 bytes
SHA-256: a6ca4116bc9bc8e6607a28d9e397788e3102ab9301ca1adc045f8ad1903d5de4
font_01_sfnt_off0001263a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263A 10796 bytes
SHA-256: 3423f14ba6d8119eec6dfcca6700b63fa1c40700c36b36e40f637f2b13770e21