Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d52e1e344e7234…

MALICIOUS

PDF

92.5 KB Created: 2021-07-30 05:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a6e761dec828562289733dff2b87057 SHA-1: 15d712d398a17543fe349885f984205def9c172c SHA-256: a0d52e1e344e72342144df60ea6f8a7a1f3c71d2b32ec7fe6ed41e9587e83013
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs hosted on compromised CMS uploads and disposable domains, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristics and URLs strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2c37ebf0---77274309622.pdf In PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210715182630.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098cf33b01d6---79109560210.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/7p680iikrej2pdtsjaf1tmi7d1/getovipakewonejomiro.pdfIn PDF document text
    • https://inncredel.com/uploads/nosog.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/punasixadobiwawifijevox.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cfaa6e5b0de---69967186549.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210719150850.pdfIn PDF document text
    • https://sapporopools.com/contents//files/xepijaroguwabe.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/xujarizexep.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/ded1da50fcf328907406993326cb4175/wivogaludumek.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/18a713b0ac54014c50e3829a61f0f7e4/9658496580.pdfIn PDF document text
    • http://abpaluso.com/upload/file/90767410614.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/3525804739.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/92064010560.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/bakovadupedawemuzugiwalex.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bc104d217---bewikuxizomemeladafopajo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/bd03ef903aca43d0039ccd1f8f89baed/petezelojozi.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/50617309939.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1e2e5207c---90499634833.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ee150620---bepej.pdfIn PDF document text
    • http://leise.ru/admin/ckfinder/userfiles/files/57101281748.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b44f1747e---kuzimesuxazedapobeveko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=flight+game+unblocked+hackedPDF 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_off0000fbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E4 10860 bytes
SHA-256: 4635570ce2319c001c78e0f90fcd25dae979423307f5d40ebe6bd2c63f9d1248
font_02_sfnt_off00012c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 20524 bytes
SHA-256: 1a280c9a867f604e6c3824938ad21650c5cd703d7362cfb71d3bd7e0e16b8202

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