Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4b0c0fa0150f55f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-03 05:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d632f6be72dd0022ac6a6fc947e830c SHA-1: b0391b4fb36a5162e91d833bce40166a6edad09f SHA-256: a4b0c0fa0150f55f7a1b6e4576cee91666abbd8c792d0c34bfc077d97dfa9131
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to lure victims to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://laborke.ru/uplcv?utm_term=bu+admission+circular+2018-19+pdf PDF link annotation
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1446dc6b6e---jobonofigigawuxa.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/jolefilekuwavefedizimit.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/33610022209.pdfIn PDF document text
    • https://pellevah.com/upload/files/57048121372.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/bakaliwasav.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac13fee3ef8---18205411608.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129a338f26a5---31100914853.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2498b845---fadis.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6c8486079---joliwa.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25f5c45840.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/ginixiwixelabufejoxe.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae28ac003c---bebosefa.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/3170993668.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8b84urd4uc4limstdbppkunffk/67262807087.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/14358334662.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/majulorinuwixejagorir.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd27b04c0---30713781448.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/mebivozazumudixibox.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/ca9c894c356741f5d96b91c6e72eaced/10104163314.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/64407885828.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/monudaganivafe.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/80b70c73b5c5cc7b56b230dc7fae297e/dimawezulo.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/xegisapu.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/59031910135.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094272b81ef4---93712720997.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_off0000bb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB38 11408 bytes
SHA-256: 11fdd55b8077b6be02d343c55655fd3511134e0f6d1aa3e9d338f96775ea1230
font_01_sfnt_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 18976 bytes
SHA-256: c27840ad0c7740ce8eaed58c858bf32ecb475640162bf3e6e2ed3f5f02851371

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