Malicious PDF — malware analysis report

Static analysis result for SHA-256 08aa87a4b7b6dc29…

MALICIOUS

PDF

71.5 KB Created: 2021-09-11 03:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd9d2529ea2fdad55a3f414587db2f18 SHA-1: 6776e1071b4ddf47686ebce8fac4fa94576285f5 SHA-256: 08aa87a4b7b6dc295c460dfe420fb2baf18eb7fa229d8cd039dea86cb8da1858
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://crysiq.ru/uplcv?utm_term=android+studio+translateanimation PDF link annotation
    • http://pzhjintai.com/upload/files/suxalerimaserujob.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/majanujepibo.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/2ds70iqe3jkh2cdr1q8odt1qba/mabewube.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/f62c1b36baf807dac665dbb036b6e7b3/46178874983.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/fewinivinukunazopuj.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/dufutilimekax.pdfIn PDF document text
    • https://kratky.eu/files/file/92601476792.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/82799552476.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/pugixexu.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec3e45ee2---nujijusapasamebim.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/zokememadaf.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/naparalenezozipedopuriwi.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/73502897653.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/tilidokusolaluk.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/zixilopodonadegi.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/03807bb5aa7e1a83b3d25e5d81c8dcaa/65857214586.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a86e570d6---pawawovuzu.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109081937575207.pdfIn PDF document text
    • https://subded.org/userfiles/file/28577267538.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/doxafidotubapatadad.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/fevasaz.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/xifanodoz.pdfIn PDF document text
    • http://www.bash.cl/media/file/wixejovijikemave.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/movoref.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_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 10488 bytes
SHA-256: fe546d220967ff59c500c88104cc54a8613ee8dfbbd98b1dfb5875f2905fb18e
font_01_sfnt_off0000c8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CF 17888 bytes
SHA-256: b89a86b5bbc272f48bcb4c0b9333e53d387c038fbacc25bf674dac0f77ba2cc0
font_02_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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