Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c929e92f187244…

MALICIOUS

PDF

91.5 KB Created: 2021-08-11 20:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ae0a98aea4ed866227092c8692be0d3 SHA-1: 330a751c7cd7c7af4413cd615e72b02245eb2ef1 SHA-256: 20c929e92f187244eb0ff024473560c996f557613793a69e6be956710c545209
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to various compromised websites and potentially malicious PDF files, likely as part of a phishing or malware distribution scheme. The presence of multiple external URIs and compromised CMS upload links indicates an attempt to obscure the true malicious destination and leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=the+chronicles+of+narnia+the+silver+chair+trailer+in+hindi PDF link annotation
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7489bf66e4549433e51341c089420def/digitotilevepezado.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/28859478269.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca310df14f5---wunifaguna.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/060b5d18ad1b33e3ccb69538b82e0ac1/56081542699.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/38449351180.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/753cnh1u50sqsqanl4suphbthn/tuwumizesapibukona.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/22503152912.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/fusukipizu.pdfIn PDF document text
    • https://wineart.online/userfiles/file/56923768703.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a25cce9f43f---dasirakaxig.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/xedojilowesetosemam.pdfIn PDF document text
    • https://akemi.ro/hirek/file/54707061360.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/zenunixozife.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/nalebatajelowiwotaxanikof.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e163b9ebf5f3f38b8ef59e3b9fb9206e/58210821847.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986ede5d3f2---monilugaxewu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d039568cb3---lojujebutorufe.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/bitiju.pdfIn PDF document text
    • https://aashianarealty.com/file/47790089814.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/13ffbd96847d253859d20532e8008632/40530723967.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd217ce0eb---75987411775.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/lfvdlb534nmn9ija9cboii6lvc/67882771715.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ba14ac3f727df5892179fd1784d97691/toweroxadamodipizig.pdfIn 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://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_off0000ff96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 17856 bytes
SHA-256: cfb464154085f42f47986682c20e3cbbf29cded8540a09f42c68f6f8ce9c05b2
font_02_sfnt_off000146ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146ED 10600 bytes
SHA-256: b3788a4b846a058eda8b7c2f390f90eaf3e1aba42442f52685a2aabe603de8e5