Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2b7eed424dba3e…

MALICIOUS

PDF

73.3 KB Created: 2021-10-09 02:15:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f345732bb381f26147c4eb52f604046a SHA-1: 38f1437f40af8b73382a9317a5fa312a0236753a SHA-256: 8e2b7eed424dba3eded774d978f08d982d8a7ec558491919749d12366b24a16d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The heuristic firings indicate a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=95+theses+church PDF link annotation
    • http://vers-ma.de/userfiles/file/sokub.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/t791j4bq4g9qgc5nr2qd9ls3v2/nisiwiwevajavixexow.pdfIn PDF document text
    • https://birotex.rs/images/files/buwijugisebelogigopisanol.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/jopenapiv.pdfIn PDF document text
    • http://lecostationery.com/files/file/mapufem.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/jipewibagipasoxizogolegof.pdfIn PDF document text
    • http://aa-nusd.jp/vuseg.pdfIn PDF document text
    • http://wajl.net/img/file/202192394938.pdfIn PDF document text
    • https://cubic.is/userfiles/file/dajopu.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/dotadu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16160c36354de6---71927129332.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/jojivapu.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/nusokuw.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/xufan.pdfIn PDF document text
    • http://quetthe.com/upload/files/demerupakokegazexulafowi.pdfIn PDF document text
    • http://deltools.com/userfiles/file/kovategikebodinoxusux.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3c8f2598e194fcf5095c7ebdcf8ea447/34555353837.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/26138310896.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/rodoruwapa.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/82a241.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/gadeweli.pdfIn PDF document text
    • http://www.toptehnik.si/images/vurogixobazawinudekidojel.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/vilegebadesuliles.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_off0000bbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBB2 17616 bytes
SHA-256: 2c4155c2c89fad1b1bd962b50aa252a52781b0e26dbb2ca0afa6d6096289b050
font_01_sfnt_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 10108 bytes
SHA-256: 4252a344778198da77619cae30ec43cb27f8672e3af99c653293fd5f9589540f
font_02_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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