Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e07b0dccb4f902…

MALICIOUS

PDF

72.3 KB Created: 2021-09-03 10:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9b004b6ae3bb60588a29048bd0e86b2 SHA-1: baf151125eea69ad79cee50d6f16102ecfee0211 SHA-256: 66e07b0dccb4f9027f51c1be75a7b397556e65ea1caba669f603d07ae5f06d31
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://accessprecision.com/userfiles/file/tifiniguvejakulobivedugu.pdf In PDF document text
    • https://bednidhitraders.com/userfiles/file/mibufonunuvobuvovida.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/4171866668.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/nisjgkt5vn6i2f1o0ej2u6ra08/zewobigij.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/virupexozoveju.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/fasedupewo.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/xunepukarumemosiwitiw.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/vepejidugaj.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3cf602c70---57618143004.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/10623323715.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/69534332329.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcd757f15e---72151049791.pdfIn PDF document text
    • https://kermanrooz.com/img/files/penizafopavikinenoti.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/83655211957.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d044bd1276a22a6ad8549c02b95ee2b/26016557619.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/36688466609.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0f55f477d03de2d80cd442e0acb2fd8f/siguto.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/9955524946.pdfIn PDF document text
    • http://askaudit.ru/price/97523941600.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/teminofuriditagox.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/sivijijezokolorexu.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2htut9q4thm6ts6imn40kk8aiv/xepibuwixigis.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/sulugudukasaposa.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/70962768625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=arifureta+after+story+3+pdfPDF 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_off0000b816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB816 10708 bytes
SHA-256: e48a2a120bf28a8b5d4a1d17c345d7f24f9c342f0688ef02948e1f85f2268425
font_01_sfnt_off0000d0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E8 16516 bytes
SHA-256: 61056d2544e6c725be83902b812638a92d805e2951e36e9bb76717d7726bae09
font_02_sfnt_off0000fba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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