Malicious PDF — malware analysis report

Static analysis result for SHA-256 48947eb245947b61…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 00:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f82e2ba2d6168c969aef9ba4442bb18f SHA-1: 55778b10988a0835d240c2c0f546804e6d258fb8 SHA-256: 48947eb245947b617302216f2d77603c2a4d63b65e1aa3481499ce1edba8b3ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1c1584119befda55bf3d59b939edc71f/44730799080.pdf In PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a0986fca09a---43340519900.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1d34d214e---74592980829.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/16558650002.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a149beee293---24680294819.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/juligodebukemerubup.pdfIn PDF document text
    • http://centrons.com/uploaded/file/184518447060e861f176fa7.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/b0977218d67133ec020a110994f7f52a/12093735164.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/xoxosilajuvejepi.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210824060402767227.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/lizexuvemeba.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/fasorowaxekiretowatotazi.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///gutirexuwepapedomupuxa.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kujajuj.pdfIn PDF document text
    • http://fullx.net/files/23514357222.pdfIn PDF document text
    • http://ashioke.com/images/library/File/68206125164.pdfIn PDF document text
    • http://www.77ice.com/upload/files/18053467315.pdfIn PDF document text
    • http://mramus.com/fck/imagesfile/kafidegemomasivosapap.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/fc1359e22ab3ab95d43cc9c668ab752c/jilamoxegujopuxi.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/39584595860.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a01c202066c096244ceeb8ee9c739d56/47857759817.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/misimosexujunadaligut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=conforming+loan+limits+middlesex+county+maPDF 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_off0000dfdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDB 17892 bytes
SHA-256: 20f7f6f4717d2a683039291e89527cde85c510589781cdcaf07f7989e4e99814
font_01_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 11168 bytes
SHA-256: d51c65ae42496292ae17ad2bde54fd28ae301a333d2108ad3de23becacd5bd50

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