Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b4babe651a79d4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 05:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a9276a8a3ec9f25a899e63a0d5fd4750 SHA-1: 96a1fb60009c695f7ac0fa04a976c75a9b9a5dfe SHA-256: c9b4babe651a79d49925901e289ec2cd5124b1656c4a5cf7068d8d604809444a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URI links and link farms on compromised CMS uploads points to a tactic of leveraging potentially untrusted hosting for malicious redirection.

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://coretry.ru/uplcv?utm_term=bubble+shooter+java+game PDF link annotation
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/64599163692.pdfIn PDF document text
    • http://surtek.biz/image/files/20150328_143939.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091906522036791.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa4760fb6a---58856640967.pdfIn PDF document text
    • https://stvorki.ru/files/file/93288442428.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/jewinotekadabavesegoni.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/5471256404.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/64034170312.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/vunevepimo.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/420a01fb80a34d2463526138bc4b6efd/nabelalenedozeguwoziba.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d89c00e6a8---wufavisut.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wawirisaboxugapos.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/38311149081.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109132100477869.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/71406905908.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/8881174803.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/motududofeporazoripe.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/sikifobotita.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/j9qpc58av73fi4ho0sa7m4q311/10559615338.pdfIn PDF document text
    • https://soechi.com/userfiles/file/taduxotetiruwojomapa.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/xowexifopidil.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/91291979329.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/mejul.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109170007015574.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_off0000d363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD363 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 10848 bytes
SHA-256: 9835a2cdb66c96a93434b418b375d600cf5f26440b7d0612d27a10dab136a272
font_02_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 18132 bytes
SHA-256: 1788fdfc9863f485ffe71b453ae37bb78d05b576dedabcbd492be32a9c682e19

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