Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e305d876c0845b…

MALICIOUS

PDF

89.9 KB Created: 2021-09-17 04:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b8bde6f7856aa75f9aca304f2c4bb401 SHA-1: 91cffc618232d57cb12c65a254aa1572915411a8 SHA-256: 77e305d876c0845b3ac756cf6cdd76a7e2a818c5d22867e270170c5cf519a071
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of link farms hosted on compromised CMS platforms. The primary lure appears to be disguised as a link to watch a movie, which is a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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=watch+free+frozen+2+full+movie PDF link annotation
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f14c5a424b---kuvejemavivufusezowun.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b81191d4c---wozoxuwudi.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/57801249434.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/1934980569.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a85664f8b2---63251859850.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kuzot.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/sipavofu.pdfIn PDF document text
    • http://www.kroonzuivel.nl/ckfinder/userfiles/files/19687671740.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/vapapavofatevatejepagon.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/20265862209.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/vovabikujobevogowa.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/47006235246.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/nutum.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/mafulideged.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/sogodenonajukediguwoxil.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/totokilor.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/22721456830.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/wobofuxawozenaneduvetav.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xowapimi.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/zuriterurelerofitemax.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161412ce2e74e8---molovubejafefemedus.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2f659fda1ef2251420a7daec428b94bf/luwokilezakibiwumi.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/1587626246.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/jodezurudasobenuxudejuki.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/katakadajebujuzolotagapo.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_off0000fb8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8C 17596 bytes
SHA-256: 8eaea46b0e54125368970329edd3495da2666f72a423b3ff1cab6fbc5b9bc576
font_01_sfnt_off000128ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000140e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E1 10772 bytes
SHA-256: 573acd27d071852a6bd46b28ba84f3149022ef372ba6589569196da9f26cf2b8

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