Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c899a6dcdd4121…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 21:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54d88a9183dc9bcc65a14d624bbd3e7c SHA-1: 5516fb0ffc26f90c19467a7d2c9469532d45e00c SHA-256: 89c899a6dcdd412180ff445be6ce8aa0e9c61aa106792ca77142d96aa7f54298
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous domains, several of which appear to be compromised WordPress uploads or disposable hosting. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://onlineadda.net/ckfinder/userfiles/files/66610519554.pdf In PDF document text
    • http://kirakuramen.com/uploads/files/nixezifomodobu.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/kuvofagemekurug.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109081848375575.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/93807875929.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/viratu.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/litapepebamazoporuki.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/efc88a8255956ed342b4af555590e8f0/46362579742.pdfIn PDF document text
    • http://recrute.fr/files/files/laponesajus.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9c09e705525e7964d1c0ee4a4f244da7/24839263606.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/piruvojiwi.pdfIn PDF document text
    • https://agermag.ro/mm/file/bibekap.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/18317156924.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/3c47c5dc89fb8133572235ac15fb2337/97483427113.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614890e227cf7---79886150512.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c944c4d7f---32936169813.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/84880371777.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/pezir.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/24429265828.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/tekometakejawotabobo.pdfIn PDF document text
    • http://villkasz.hu/editor_up/72566596444.pdfIn PDF document text
    • http://qdjshg.com/files/file/90846446657.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614df7c7befb4---geranomamuxalerefo.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/iji6925tjijcd66fvsl33f9i0r/12404295816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cost+of+creating+an+android+appPDF 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_off0000b2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D1 15068 bytes
SHA-256: 429e694a56cc168f9877cd985d770538507dd56ffeb77b3f72c84be693a35f4c
font_01_sfnt_off0000d838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD838 10780 bytes
SHA-256: 6b3a17e2164b36f091795ed3b7227bc0cbf5a37b0f2902e49320392347998c92
font_02_sfnt_off0000f0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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