Malicious PDF — malware analysis report

Static analysis result for SHA-256 4926aba5366b282d…

MALICIOUS

PDF

89.7 KB Created: 2021-07-25 21:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 32aff4baa921df64995d8c1405bbfcb7 SHA-1: df1148dfb9447dd8e2fb8fe8768d38d67222da4f SHA-256: 4926aba5366b282d1fadc305b11dc1e82e13631325e3789ecde1f72442547b51
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/746e9e5237ee79c0b186774d0d4bb70b/6033285422.pdf In PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/sd6apq1tersqt913svbnh1bs5g/zulazu.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/pibebimolinifaduvuxuf.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608359efa493f---99603885526.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/mirasirulovofurobex.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///widodumilezujemomezesike.pdfIn PDF document text
    • https://lecapsuledigian.it/file/92358443236.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210615203449_b2fbof.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/fugaso.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/facbe452519f0ff33908e16590050db5/943583745.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b28b061914e---43651029185.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/fdcc4c3276983d8180cd30601a2bd1e4/95174027000.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/21260933165.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/5b414bf70c02d33d61a3af2554775a14/lejaxow.pdfIn PDF document text
    • http://axwelindia.com/uploads/nijigepesovived.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36656955333.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075eebdeb4b9---najigugudozixib.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/6603828442.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/84462618112.pdfIn PDF document text
    • https://diphong.com/uploads/xamivamovofafapenazewi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c41ec2cc3---mefatotuvelemar.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/60639737383.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/3144726514.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6daf3e02d1---wefakeb.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/vefikol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=stereospecific+reaction+examplePDF 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_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 17476 bytes
SHA-256: 12198d00ba3994e9d311ec0025f71e4b557ad3322e421361759e814a7dbfebc9
font_01_sfnt_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 10816 bytes
SHA-256: fbfd053689425bef3370d155cecaf2a1caa78cfc16fc3fb8d4ec355c54adf988
font_02_sfnt_off00014057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1