Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2824a15ed1ef5cb…

MALICIOUS

PDF

82.7 KB Created: 2021-08-17 11:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e2e8a890ee3f81b24fc157a3ed5699b SHA-1: 80bde57a2774ca97720c4ba6e9c1a38ef479b009 SHA-256: e2824a15ed1ef5cb4b5cb038b3f0f1215abd09cadcc0a7e786dfd37ec70d0f5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the link farm heuristics indicate an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a75716a2---xeduvobodizazezikeb.pdf In PDF document text
    • http://lideparts.com/userfiles/file/1622506257.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/4586763130.pdfIn PDF document text
    • http://khotelmarket.com/FileData/ckfinder/files/20210630_29ADA7BF1E2E1D34.pdfIn PDF document text
    • https://basisnomor.com/contents//files/32182494512.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/829c7aece0add4187e5a21b171b2d469/66336884981.pdfIn PDF document text
    • https://rotherelectric.com/files/98696609562.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4876dbc05---sasojineponogoneliwexix.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d87e5d96e---luwokep.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/dutabaru.pdfIn PDF document text
    • http://mq-water.net/upload/rudalebipofo.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/65224234833.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/rebovusugarogadege.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/17/file/20210617_170519_183.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c3439686c2540a609c98a24fab22c96/rifegewexigabug.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160888f8764874---88575369687.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a948b526910---befebavorexu.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/kubepe.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/piketewipevebo.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a573df40f32---32649327325.pdfIn PDF document text
    • https://actor-conseil.com/files/file/xidezuwofikonofubuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+graphic+design+exercise+book+pdfPDF 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_off0000dede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDE 11052 bytes
SHA-256: 628aa78f753a27ba8dc82ab5eb3f540469b18621189c080959164ac56eef2b03
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11031 16952 bytes
SHA-256: dddbb585a66657b855703ef8a5a343ed7349f37fdc13d88c60cd807464838397

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