Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb92cbb96f9f6435…

MALICIOUS

PDF

74.6 KB Created: 2021-09-28 04:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbc5070204e7bfaa5b9c0430394b53d0 SHA-1: 5e6cdf8756465300a312a3b54400e141d661d54b SHA-256: fb92cbb96f9f64357554ebe11c7d08a5f8a228b20be8671c8fbf995bf48b66f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm with numerous URLs pointing to other PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of multiple external links suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://viprealestatebrokers.com/userfiles/files/89579172800.pdf In PDF document text
    • http://icaalliance.org/filespath/files/20210916152722.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4ee0715bb1044b257135bbb92cc441fa/lenudaguwabenojoxidolun.pdfIn PDF document text
    • http://meditopthailand.com/file/fozekasaberovatogi.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ff5730da2bd398c1f2f2b6a6f109a8bd/77554227223.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/goperer.pdfIn PDF document text
    • http://surestegc.org/documentos/file/59010717013.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/3825856321.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/kanebijesifagamugoroxarug.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/sipozuwufirimebomew.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/meliwasifoladarexedumeme.pdfIn PDF document text
    • http://accronline.com/userfiles/file/fuvumekekekevu.pdfIn PDF document text
    • http://netart.hu/userfiles/file/wupogoraxisuwolevi.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0f3c1f7b---gigotudilubova.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/23574707411.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/kivufavomaxivogomosa.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/18102884877.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161395a189adef---10819520677.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///26992259601.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906212333.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/tulibinijofolatisika.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210918/files/20210918052933.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8df381ab4f51a8bc693f6e0edecd9b9f/23293073765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=reduce+size+of+photo+on+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_off0000ba33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA33 19164 bytes
SHA-256: 775f780f034cf0c81861f3058c2eebc2f2ac1737a5e20071ae8f0a12c8118d64
font_01_sfnt_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 10876 bytes
SHA-256: 0a979fe3f9042b43495079a7f8a9e10661be2a4ed748280ee69a8aab81c702f4