Malicious PDF — malware analysis report

Static analysis result for SHA-256 06939bbd046044ab…

MALICIOUS

PDF

96.2 KB Created: 2021-07-23 22:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82d3fbf6dc25ad1c73198db70861cb75 SHA-1: 81b748346049d445e05c26ded01fcfdc96e87771 SHA-256: 06939bbd046044aba7957130dd85a7e66fb223305ef092045535429ffe4aa2f3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting an attempt to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload. The presence of embedded URLs and the nature of the heuristics point towards a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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 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 http://standrewsparishhighschoolclassof1964.com/clients/70428/File/kimorefabenoxu.pdf In PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/zijafazekafikugineko.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cecb5d6db---wojedesizaxusotis.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/431mpnoi0oa0eopuf4e7e9tr33/19345546524.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/60183729576.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160877dd47b735---bafafakowi.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d9128a706---koruzivekegon.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/ed2da756260f7b561819d5d010b21d19/22283091511.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/36485436600.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/r8a21gvnpelc7bnmccenpsrdqm/tilujove.pdfIn PDF document text
    • http://topstec.com/d/files/95952136122.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/50663346982.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/2fd30cc5ff82741ea665ba4cd8012283/vegevigiwifafetazege.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ac2f39e7370f7b8e2b30aea175b9456b/levebafixikuzupekotuvenix.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741dd6e06ce---wujibudagebatogigadujeb.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2hhjt12assea78k2smukpdood5/xekatidi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/6e4d4e51b77fe034b2b8eb65dd9076e3/gogam.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/sovekefezam.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/6045a78df1f764e5dc21d2f2a5372ac4/43136424497.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/66107184296.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/segavuratusos.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/mawufopa.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/nejoxamivuser.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/majatixovunudukabobosoto.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/37e957f1a53eda9c9e2922908e11ecd8/biwowutim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=what+are+the+literary+techniques+used+in+poetry+and+short+storiesPDF 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_off00011558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11558 10964 bytes
SHA-256: 8c62cc3655ff3e952e52842c181993c128138765079561d3c99587270ed14ac6
font_01_sfnt_off00012e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 16748 bytes
SHA-256: 169c0e7dbac4a9d627f4a9c77e56e2a0090bff03956f2a1af90ed30f74cd293e
font_02_sfnt_off00015993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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