Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdc24b0251ee49d…

MALICIOUS

PDF

91.5 KB Created: 2021-09-02 16:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bff5e86151267bbf4dafa69685eb65d5 SHA-1: 8abf13c9087300174c3a1f9bf523cc07cb9fd42b SHA-256: bbdc24b0251ee49d73ea8c28972d2ca941d28d6435ad6c6feb3bde3b2a327363
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=quest%C3%B5es+de+concurso+atos+administrativos+pdf PDF link annotation
    • https://tl-systems.hu/files/files/52314943755.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/kufasafebetumojomopasarod.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c6b988c88---lenakutotazof.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fetifade.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/kuxubakewegogutakagaxe.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/jotojalaxez.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/poviwejuwowepefepuboxatu.pdfIn PDF document text
    • http://alkimosgb.com/userfiles/files/616904482.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/egoi0q8gs6qkhiqdt1tv5m25f1/zuxefifu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160748ab124cf5---bajijusotojukuwepan.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/25987073210.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/meradudabemabudu.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/20130593857.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/kekizegiwufevul.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/q6f1crbiiecbajns8l1tf7ka39/narebitikusorabogarizoga.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160be5ca772171---8478501832.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160750bc0c4e4a---gigilivodosezo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/raragutiwokojasi.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/rewojepukesupok.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c4a6536582---wikoxilil.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/tefagogesotaxitanupo.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/47161352949.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/sufatumedetefapatiser.pdfIn PDF document text
    • https://bataretak.com/img/files/file/70570483972.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_off0000f877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001108e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108E 11184 bytes
SHA-256: 58884fccc34f6272ea49d1460e45c21213fa6b52054d49c2fb74711b08fa82ef
font_02_sfnt_off00012a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A92 20468 bytes
SHA-256: cd98ab69526e2a53704bf26befd8cd67a5fb8713b638f5eaf62289eef97b6d07

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