Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9117dddd3d2579…

MALICIOUS

PDF

85.5 KB Created: 2021-06-27 00:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 870c232f772ab81493189bfb5b67aac0 SHA-1: ac1c59a9f45d9b28d17d180671f74cbef787f848 SHA-256: 8d9117dddd3d257911d0f0781c1e7aea822174bddcb72ae2af0fd08637b7a2cd
176 Risk Score

Malware Insights

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

The PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links to external sites, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://allseasonsart.com/uploads/fck_uploads/file/71485037110.pdf In PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe56eb63d5---43772611012.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4d5c44446ddd82843f1815858a61f056/650319553.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/d12e8885ceb4db91556a93490eca3daf/jiraku.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/af46591ebaefec797304b98ca13b0307/puzetazefur.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ca9d425fc1dae1d310765f29530cb98a/zomivefekotuduvog.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/amueunu4skh5s7s1u0ffe6l7na/kinodipupugesedo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bb124bb47---duvorogizisu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bd3ac364e---saninija.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430141032880075.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/17074755099.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e6d7cdab---xemezugeguxep.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c70ee8089bd---tadagupixaxab.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074825db8c92---46986155612.pdfIn PDF document text
    • http://homenet-spb.ru/userfiles/file/xexisutirimuret.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/zedovotufidegasetanim.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a27ab23e18a---nifuxavilafek.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609740c443d79---21985609415.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/32031489218.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/molom.pdfIn PDF document text
    • http://kelvista.lt/images/files/59412117977.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/48365508429.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/f56eeab792f918d55064ace0f970167c/goxetevenukelezuzove.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/71144725792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=save+pdf+to+onedrivePDF 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_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 10420 bytes
SHA-256: 9ee7752e02d3ad3b8d31297e59d67e16516e665eb70d1e969ca3f8e29b385e4b
font_01_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 17056 bytes
SHA-256: ebed44a40201314ddbfb205e806359223a2360ccb670c1f1a18c35ad3df588ac
font_02_sfnt_off000130e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1