Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7d75764270136c…

MALICIOUS

PDF

91.3 KB Created: 2021-07-15 11:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 92b09812ed2b6048407873b62a146c8c SHA-1: cb428d1b9ec18266286e4c9f99f5764f34178fda SHA-256: 9b7d75764270136cd7a90b40796cda8a9ae3deb58d20c8d45bc216085c1d5168
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple external websites, with several links pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/ridazureborakeroleniza.pdf In PDF document text
    • https://pmeds.us/userfiles/file/16435119686.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/goramisotonajenu.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b90a9df9dd---dikivomotog.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dd925fe9d52e35eb75f1281fce8a1dcd/ropotunigax.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/safalumujamipuburunoguvew.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/kugewaz.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/62075174367.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/fuvikas.pdfIn PDF document text
    • http://webbuilders.com/files/file/gedofexaveneguruv.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/76104662500.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a9dcf3fc6---fefokevojifatev.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0f7e5a974---9872313298.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc10266f08---rawivuviwem.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608348bde3610---zuwanujado.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/60081102802.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/2773c485ecc299caa7d136b7e7aebfed/waxuleveroja.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/vakefurukogu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2a0b284ee---56596274711.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/10466193496.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gajud.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/18151797404.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/vezoluvaporagedu.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/zukutubumazaw.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/22289280186.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a48b929c6---33508794271.pdfIn PDF document text
    • http://mousike.it/img_ins/files/32639806340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mathematics+in+the+modern+world+college+answer+keyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off00010148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10148 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 16852 bytes
SHA-256: 7c5057135733f2ff34a040ac3924edf3c531bd1c63b35552ba8e4e1a62379495
font_03_sfnt_off0001454d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1454D 11104 bytes
SHA-256: 5850c19b8ffd35cd8f85c1c8c48f3f611280258ea9fda81074c78672d94f8ebb