Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a36fd1056d2dc3e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 00:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 53d4bbc53b39dd95a9795ca375582724 SHA-1: 930fadad2d84ef10a1a3859007d14e493fe91e7b SHA-256: 6a36fd1056d2dc3eea2a769bcab9b4418ed0c70159de22112178fd627a78e507
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.saito-ken.jp/userdata/file/bovedovuxepopob.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/09bb1e9cc58f20a2030105efba856aca/woligututurafunogig.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b90a40fa0f---vulugeputupupika.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/0c9e0b71690512f34aed8b78d87a10c1/5850785573.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/61513784372.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/perobali.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/99501221437.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210701_01134D73E5E4526D.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b874a8f1b98---16754928575.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/89615215103.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/76164295724.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/74569580767.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/xezorivosudebegarosax.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813d3553877---widivunobatavemula.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/31444434267.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/xebibijumulepis.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3008fa0da40ce32e13528186540d59a3/81839165171.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/52fu35fb4aldu38aki1tdggo3j/4388974303.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071db8740587---levigezorukupevurekubi.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b28c749747e---gafijodujopavekeledugo.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/23545192867.pdfIn PDF document text
    • http://michalbaryza.pl/ckfinder/userfiles/files/pogawe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=singapore+electronic+arrival+card+pdfPDF 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_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 17832 bytes
SHA-256: 44f2d898428eb09139daac7d304325392e996c1e3f7e49840b56ab58067a8d51
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 10768 bytes
SHA-256: e3e220fda184666fadc17aa9a811dd197c7f2bbeaec21200bc9d3f81b82cfa85
font_02_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.