Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ac89976d8c066f…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 03:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4fb5be75a717381999c276e6bd19e821 SHA-1: 8798a29f6dd6e21653b6c63a7d71e5731a2a6e17 SHA-256: 06ac89976d8c066ff328616716e7184a35f310fa0122014229ced999bc0d26b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://mictrogiang.com/userfiles/files/99344776202.pdf In PDF document text
    • https://giritrademark.com/content_files/files/24361443293.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/naxazozopadavo.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/28938807721.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/jipetoguxutikaveminop.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///fesowepa.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc1845282a---duguwegokamolagupevi.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/buvadedetizuzewoluko.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/valabelolapagelorudiba.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/73570319174.pdfIn PDF document text
    • http://fitviewer.com/files/file/76437457696.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/58f8cfa2fc4e42f8b0ae3f7091baea24/91500276148.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613b76c73e650---89881857792.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab8704c18---sileweda.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/38686894701.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091610095973499.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/lokidazoxomebuwifopagire.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/95319076272.pdfIn PDF document text
    • https://umartravel.com/files/sajufepojejudamuzorufobub.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/razufaperomi.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/gatixirofod.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/funowatewipefolujurup.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/luvoromogube.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/bilewajezakiwede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+highlight+in+pdf+in+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_off0000b7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BB 16436 bytes
SHA-256: d3e51f1b7ea32c9f976361a7e23413b34bdc3a320775e8a28ed9bb9725c18798
font_01_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 10556 bytes
SHA-256: c841701595c8b022bc2457a890ece69b984af978c275711359f41a8041444e37
font_02_sfnt_off0000fa4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1