Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ccb963964a956d…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 10:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8c77f21ab584b16f2de86be0669b93d SHA-1: be5516f7c0bad7ffa2536507702762953b7118e9 SHA-256: 96ccb963964a956de6b3e017368214a5f0fc7e6fdd9150c693521a205713fd08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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 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://drafthe.ru/uplcv?utm_term=windows+7+ultimate+iso+free+download PDF link annotation
    • http://ntweac.edu.hk/admin/ckfinder/userfiles/files/1881370186.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161329d7321836---39425411294.pdfIn PDF document text
    • http://kaies.net/upfiles/210902061821472620pva5b8.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wazurekidudekixenivavo.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/21721833230.pdfIn PDF document text
    • http://fujiya-la.com/uploads/files/zevibegiwekisofunijakoron.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/13598754944.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/jeninubupoxom.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/m6f298cruj0lnlc7kq7t5pav4k/75544304391.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331dce721f1---vezuda.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/gisorugadasimakidal.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/zuvalifetogikag.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/zedikivonolupafuzenoju.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/90438285686.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614222fb40b36---padilavekabafoxumute.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/73858051942.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161317634a947f---47088260591.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3thbpu1ta10scck6qma3ngtp2n/35514412260.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/822bdf266d389e269a73c5c58eb8f516/zaxatafipi.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/rorewafunajudes.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/pujugivegapirotiso.pdfIn PDF document text
    • http://parfumland.sk/upl/sadodiwas.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caae341893---tazimekiwozosedesisedud.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_off0000dbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCD 10744 bytes
SHA-256: 4d5475f5e014626fdf1435df2eab4d986fb52d528040e52082b4e35a0997845e
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 16300 bytes
SHA-256: 85953ff87328603e4170f75e2cbc35e62c2b42415f363d182101daa7cd9ddff2
font_02_sfnt_off00011ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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