Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d92534de0d5e88…

MALICIOUS

PDF

124.6 KB Created: 2021-06-20 14:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 379db0f12586ecbb50234bd2792e30f8 SHA-1: 3e1beb3fb2929520eb144787627529d0560c5c1d SHA-256: 54d92534de0d5e88c2dc51a8b85cd1b05e4edab4f0bda38f88f25b6e72bdcb0f
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. The document contains numerous links to compromised WordPress sites and disposable hosting, likely serving as a link farm to distribute a payload. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=attack+on+titan+season+4+episode+1+free+download PDF link annotation
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/bc6107c23025d5c7e9aa986ce8d7c8a4/71924365856.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dd6246eee---dukefigijeka.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/cdeecb17b032dfbe3ce9015abf699b18/81233423245.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607738dd0a060---dileteranipom.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856e8e45f77---14935646111.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67a16bbfe---ditolosenow.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/86404b492e3cfc0d68fe170783db1cd2/xovefejerorinaxolif.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/99oml60fomjpbd5jve5kta0v56/17895174112.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/1e6d172991d4b6a1da0e9b120608126f/72010983370.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/9726252434.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/d7qnkcnsnnh5msiadmru4epfm2/57787078173.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e67246f138---31557376024.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/rugefak.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/62109f3570494bac4091dfdf8d68850b/putafosebifixepakigafifof.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb1ba9b76---xiwurivi.pdfIn PDF document text
    • http://christopherdallo.com/file/saxojigomiwak.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b899cf4bf49---55762134634.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/jojudizenekis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147FD 30900 bytes
SHA-256: b580cfd68d5a4f5eb44e776ab50850b467f4e5b09241abfb526c391e134d9978
font_01_sfnt_off0001a8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8ED 5436 bytes
SHA-256: c1c253eb883b2cf43c2907c6d0a1609da61fe85e9041b30ffaec3db9fecd41f3
font_02_sfnt_off0001bba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBA0 11764 bytes
SHA-256: 6cf69c5ef8c39f5b54ffc7853267053a5b2694c0d690395a254957a984d2fed7

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