Malicious PDF — malware analysis report

Static analysis result for SHA-256 d588fc29b5bf618d…

MALICIOUS

PDF

86.3 KB Created: 2021-09-23 04:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e58eeab5f317ec7379365256197cb8a SHA-1: 76fa8848e1b946438ed11a7bc0e255f02bdc406b SHA-256: d588fc29b5bf618d3aa00515b70410a6c28f55a0afe086e457862431617aa0dc
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload storage and disposable hosting. The presence of a 'download button' lure and the ML classifier's high confidence score, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicate a malicious intent to deliver a payload or phish users. The embedded JavaScript likely facilitates the download or execution of a second-stage exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=generator+code+v+bucks PDF link annotation
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/rodbrord6n8r7v85bdohag36bc/gedivivowemijebube.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/jugubemodidodip.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/7807510755.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/kelej.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/60834110461.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/rimibakovasotenujeka.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210912095828.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/1e52ea175fe2a3e803f7131218f690d6/jofepifoj.pdfIn PDF document text
    • http://www.videocopilot.net/assets/public/ckfinder/userfiles/files/xalatomanatawufi.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/88897954301.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/48236507560.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/97563114050.pdfIn PDF document text
    • http://smogy.ru/files/files/duwolumufa.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/kikabebubuwizud.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/rofidapudusa.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/kozasofefujomakom.pdfIn PDF document text
    • https://melz-feu.ru/upload/nonaligakem.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/26988994697.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/75726803618.pdfIn PDF document text
    • https://matratva.in/userfiles/file/64844469708.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/fidobizafulofajini.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/99717012862.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/desuwiginerevaze.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408eb55361e---23744586048.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_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 10664 bytes
SHA-256: c4f61bb180989a128287b87e61d39f3bc3ca2581729981a20f8ff69b9de2b327
font_02_sfnt_off00011c08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C08 18380 bytes
SHA-256: 76046dc6c429e7df01fb87580918ce48e30bb68340b96cea27a5e96125f35268

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