Malicious PDF — malware analysis report

Static analysis result for SHA-256 7971ef9fbeb8ce63…

MALICIOUS

PDF

100.2 KB Created: 2021-08-11 16:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fb7fa89e2a96f1d3e5857ea73c298bf0 SHA-1: 21c1e9c143ec4e82ca168ebf4b7795e30c5ed757 SHA-256: 7971ef9fbeb8ce63b31e5e11f98bbb588ec11814134294f7d1943eb5c3a10df6
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of a password-protected archive lure further supports the hypothesis that this document is designed to trick users into downloading and decrypting a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=best+uk+theory+test+app+2020 PDF link annotation
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ca50add33---56671072437.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/9152142120.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/foduvoreluro.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/2b6f9d15d08bd8e116eb74aefbacf0dd/devebuzagadoxo.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5e35c00e8---48804209927.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/dalavogimunaj.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160930965a1836---mapaxenujukurexawajupa.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/jomazujanabigi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4d05a265a---23925366099.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/24466206493.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca2fae43ddc---21128883228.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/c4be7a7b25dfe529da4c4757bff8f21a/55218692453.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/6309836245.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/96046270566.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e779de895a---basewisenexowubufowe.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210722032949.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607005662feaf---69372079936.pdfIn PDF document text
    • http://lucidareemantenerepavimentifaidate.it/userfiles/files/60272701481.pdfIn PDF document text
    • http://benetalent.com/upload/files/vofabesotafe.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/44769361138.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13568cf93f---87023282135.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d3ea7db052157c4fbfa85de0c32010ae/53247903447.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ukt704k4aesds6qeagehbm1oog/86040694418.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160882098888a6---42991102903.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_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 18044 bytes
SHA-256: 870134a513f24b0368624f26c3d9324111ed89c68fd96cfb0a6e8184c97c41fa
font_01_sfnt_off000151a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000169be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169BE 10708 bytes
SHA-256: c10f6e7fff76221293b8982dfeb153dc643ea1b7ff1fca137d353a3eac3140a7

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