Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27cb4a3b3d3a5b3…

MALICIOUS

PDF

84.2 KB Created: 2021-07-22 19:34:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d5154b1875801cfa7c0f99e73a042cd SHA-1: 059abc0f3fd89650acbc88d27e497044fdb42b73 SHA-256: d27cb4a3b3d3a5b3d686396b87ed64c972b1f3d7ebf6ec690318ad5bb04a3a01
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608292de5d390---zijasalonuwuxeleludad.pdf
    • http://belgium-ex.com/images/blog//file/5112090827.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5414ebd2c1619a548de04c12279f0864/63276445537.pdf
    • http://heaig.org/editor/ckfinder/userfiles/files/talabenanegavon.pdf
    • https://dusunceokulu.net/resimler/files/wefogokalobirido.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/2aaf3e18bdca638eabcdf75c97135f08/nugabikawabewo.pdf
    • http://beamstraffic.ae/amb/userfiles/file/25694965099.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe87e1f4bc---derebodosefako.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160732a4baeabb---kulobejifele.pdf
    • https://marljivo.hr/UserFiles/files/99843655896.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/makinurataraxuwutofeda.pdf
    • http://alemotta.com/resources/original/file/57838465457.pdf
    • http://sakuragiramenandsushi.com/uploads/files/59419553532.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f79ab41283---dupexalejetivolepusofi.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607e969551093---lozokodinibiwirixulola.pdf
    • http://coffee33.ru/archive/file/lisiluvu.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/46928883676.pdf
    • http://skontrolsengineering.com/file_media/file_image/file/daperakeguvusawuk.pdf
    • http://pcwenhua.com/uploadimg/file/16230302231796589103.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gfifmmdpf9asbk67ftl4eh5fm3/sujuzodej.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/feb65jnkuibvjsh00iucimg4h2/bojowovajigujatap.pdf
    • http://liburnia.pl/userfiles/file/saxalebojesudu.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/45518902942.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bbsf3k52sv5h9a81ot4igoudcj/56721168867.pdf
    • http://ricarda-allegra.de/userfiles/file/nixupokuranor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=statistical+analysis+graphs+and+diagrams+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c9.bin
997c54b269d48ca9627291778785f438cf4ac068da9bb8277f755621973bcaaa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C9 11004 bytes
font_01_sfnt_off0000ffed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 16792 bytes
font_02_sfnt_off000117ff.bin
ffbf3008794e1a85f46e9132c9ad2873ef5dbe88e3e1c8996a8fa5527707b582
pdf-font-stream PDF embedded font (sfnt) at offset 0x117FF 16480 bytes