Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b3f5a61dc3c3cf…

MALICIOUS

PDF

90.3 KB Created: 2021-08-05 13:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d7f39d4d39fcafeb3018a24fdba4b9b SHA-1: ef1668b88b63db25a50af26736834135e9b62127 SHA-256: d2b3f5a61dc3c3cf72246a804929e4f65d706c13a2b303b5ecccfeaea07e06cd
252 Risk Score

Malware Insights

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

This PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript, links to compromised websites, and a lure suggesting a password-protected archive. The heuristics indicate it's designed to trick users into disabling security software and downloading further payloads, likely through a phishing pretext. The presence of embedded JavaScript suggests an attempt to execute malicious code, potentially to download and run a second-stage exploit or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=pdf+previewer+not+working+in+outlook+2016 PDF link annotation
    • https://bestcoloringpages.com/userfiles/file/30781918866.pdfIn PDF document text
    • http://santabruna.cl/upload/file/94854337721.pdfIn PDF document text
    • http://gtshotel.it/images/file/90050189388.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/73141173940.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/34fcbcea49582a23e306429a8462b4dd/15878767592.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/kogitawevajarani.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/65382991550.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf032ee8b---39790936436.pdfIn PDF document text
    • http://flirdining.com/uploads/files/2002704411.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e8f033459ab3895efb4a81620390af9b/3009114719.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5de9a67ad789bff8185b9e7db9852ff5/85801206889.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/xudulonod.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/2005113270.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/pajazawufiparogikuvore.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/ff5232d2798e8008bb443536f45e8134/joxarenonunuw.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757579b678f---wumovofolaludadowubajuwux.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/20175144527.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/54320076820.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/8837073636.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608def61a49ee---60673642488.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/tonaroxupewiruwifowoxute.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/83923808402.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_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 11152 bytes
SHA-256: d451e4f5d2130c3c1e9889ceee4fb9fd16272ebbdf6a9a27adf4ac4e44b1c139
font_02_sfnt_off00012b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0C 17628 bytes
SHA-256: 421492c9a83c3d5d7bcf07fad00829725d7307e2d2f91f150e7612969864fdc5

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