Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c5837bc1e73b4a…

MALICIOUS

PDF

110.4 KB Created: 2021-09-01 22:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 404ff0d00e85806901615676bb7debf2 SHA-1: 8be3b8a0b9e2ce1008e6c623c639103dfb6b74fc SHA-256: b5c5837bc1e73b4aab28103b0314e206d3d30fed384bf88143607ba06a20a9fd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to malicious content. The file's structure and URL patterns suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/uplcv?utm_term=joseph+and+his+dreamcoat PDF link annotation
    • http://fotomil.pl/ckfinder/userfiles/files/vawejevavodaxaforawonusom.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/90368753798.pdfIn PDF document text
    • http://ecole.ru/text/images/file/81902201545.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/90532644957.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/f93370093c9248c333f4f4ae6ad0780e/4516747663.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/voligegajujisabolegid.pdfIn PDF document text
    • http://contelex.it/userfiles/files/pupetaxonesoxasomek.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b76a24cc---14943704905.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161211764b0129---67532426019.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46269221101.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/fuxavejenotibuwafok.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/kuzeliluparuvuv.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/somimurusutatulodipe.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/7565a5895fa3bdc108490c6b1a08d0cf/20803822200.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/gumizojuravedolidobap.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6ee87058---53302677014.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/e9m6mgreo0ba38mjarj0fa4i3s/97184786514.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/23750413510.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/kinodomoro.pdfIn PDF document text
    • http://hutergroup.de/userfiles/file/libexujupegadivi.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///navifufawesazofutidazu.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/wanixoxuvut.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/xibijewexamawamodo.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9d0ad6b42---fajuzuf.pdfIn PDF document text
    • https://2acontractor.it/images/file/84664433843.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_off0001491b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1491B 18672 bytes
SHA-256: 66d69d9d3dba4ad999dc55990ecd0104b1a29a676c68de6f64d4d13ca59c872e
font_01_sfnt_off000179f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001920f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1920F 10724 bytes
SHA-256: 5f5c3c8649c183bb024784eef49aef6b3b927936efe9cc4c8b13f7988c11aa04

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