Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be0ad0ac5388dcc…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 19:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b5062c879cff79e09e2fcc4674e465a4 SHA-1: e1bc93e53ce618226bd5931348f4aaa5d24b8dde SHA-256: 4be0ad0ac5388dcca9066ae008a699b120c96155da098fb43a4eea7c7eaa6855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure suggests a link farm designed to redirect users to potentially malicious content, such as phishing pages or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://chcial.ru/uplcv?utm_term=fb2+reader+%D1%81%D0%BA%D0%B0%D1%87%D0%B0%D1%82%D1%8C+%D0%BD%D0%B0+%D0%B0%D0%BD%D0%B4%D1%80%D0%BE%D0%B8%D0%B4 PDF link annotation
    • http://nguyenphat.com/public/default/ckeditor/files/juzoxifakefijawesuxiz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161416f84552b9---wufatiwirogazekitiranos.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141d9ea7495c---xupozudifolojadesake.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0cf4a12a56f87ca746d0458b2afb3023/sarodurewarizogazebajija.pdfIn PDF document text
    • https://phunhai.net/upload/files/98474801129.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/nodv65nobban5887g5p9bvo8om/8191572852.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/wuxepare.pdfIn PDF document text
    • http://grimastone.ru/files/ferijofetel.pdfIn PDF document text
    • http://beijingteye.com/upload/files/bexujoretizifufefejinod.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/pupezatuwosowo.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109112332371688.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/pekirug.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/wivurilibem.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/gixopo.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///21285436487.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/komunogilumexulagaduf.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/pifoxegajazuguvovifizex.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa08f212f9---78394166663.pdfIn PDF document text
    • https://marosme.ro/hirek/file/73349108152.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320cd435ba1---novijozubekewenemewitewaw.pdfIn PDF document text
    • http://p-energo.ru/content/file/pujagema.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/15934840195.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/53219309803.pdfIn PDF document text
    • http://juentai.com/userfiles/files/wevamupirunekivowig.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB679 11044 bytes
SHA-256: 4a8f0104aeac8dee91feaf655ac30399fce5512035b517d60275d7681920d291
font_01_sfnt_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 19360 bytes
SHA-256: 7bb915e7d7e4f2c62b665a9ad4a375766b3043cfeb0a8a5b880295d2b3f0b4a9
font_02_sfnt_off0000fe6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001167f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167F 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59

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