Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4c147623f7c22c…

MALICIOUS

PDF

103.0 KB Created: 2021-09-22 12:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3953497a8f3e675d2ce3d2d575fbae97 SHA-1: 0363801c04a5fea49b6e2e2d9f8a25c7c1c96b12 SHA-256: de4c147623f7c22c34457f9e0c62c0aa0df6b7b907212b396eace4e85fa5b3ac
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The 'Password-protected archive handoff' heuristic strongly suggests the document is designed to trick the user into believing they need to decrypt a payload, a common tactic to bypass security filters. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • 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://gornjastubica.hr/files/26099977575.pdf In PDF document text
    • http://guojingmall.com/userfiles/file///47731894571.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/24851895878.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/21386497677.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/sidax.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/1f9bdb1899be729888225b09b8e5914c/kinude.pdfIn PDF document text
    • http://retailcop.ca/files/bidinalixebobiforifo.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/kiwerebuzigonupunad.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/jojasajebotelotax.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///ribogevakanoraboguvinufu.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb94b03d2d---junamif.pdfIn PDF document text
    • http://hkwwta.org/userfiles/32858235827.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad2e026bc2---vatubepisunor.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gv1mufgoddi9ejt77m8o0jf580/30440173832.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f8504562c---26728035121.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/nivate.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/12177256864.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f0bf32183812fa265fddb986bf60f3b9/29836865839.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ad18dde9d---15480979488.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/sovemowizilu.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319e150f06a---domaj.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/pejojoxewekokewubawugupa.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/dovokumivibubi.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/50353925298.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/zurugoparidin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=octopus+key+mapping+apkPDF 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_off000128bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128BC 19908 bytes
SHA-256: a1280ffa302318cd3e23de98e9c45ae9cb8c1ca49a5cff25c865cc3d74ddc4d4
font_01_sfnt_off00015d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17524 10900 bytes
SHA-256: f54d9203360337703d29da8a131e4a2cbb49de1cd1664aa306e6b5bd6e22bfbe

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