Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10f567c2f4eac77…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 18:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55e54d13c24e8169ab4d4a4d844dedc2 SHA-1: 601b30a86dc09dea48b8ad74d812afdc113e8257 SHA-256: d10f567c2f4eac778bf47713130a4728aea11616abb0f420b9d3d46e54d50615
176 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, impersonating cloud document services to trick users into clicking malicious links. Heuristics like 'SE_CLOUD_DOC_LURE' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this intent. The presence of numerous unknown URLs, some hosted on compromised CMS uploads, further supports the malicious nature of the document, likely leading to credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://brianhigbielaw.com/UserFiles/file/jotupidipulatipolire.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9c101a529---vurerosolirafumigikokede.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/6999927772.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/27735624806.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/45824808653.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/97049580282.pdfIn PDF document text
    • http://atonoserver.com/userfiles/file/nidaziz.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/29930071756.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/pulasitegoxokojumi.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/216e57855b9a263105315012dddfa1d1/68040877636.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad91804cba---22935479636.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160871d3015148---44792637789.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/15d81dad646d64486c3c80192e657774/47823178546.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/dekidop1621054707.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610306e595f34---jomixuxafemadovurugebew.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b6117061e---1884443570.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/punobev.pdfIn PDF document text
    • http://dogable.de/userfiles/file/58182951207.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160991b0755d19---mabopovafujalumubexiji.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcc4201dff---48129366873.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/10036592078.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd731681dc---52637940227.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/rufekufoziwifunekavenila.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/juxujotatudijurivumuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=delirium+2+pdf+google+drivePDF 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_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 17060 bytes
SHA-256: f892c59162dec5d7609502921a596b15e8b926e473df804eafb870f0d2ee427f
font_01_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 10596 bytes
SHA-256: cdd92b50d13cf9c30ad5a2dcd03a5db62bb9c8d2299782a441710765462a3af1
font_02_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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