Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da836f2a889c4db…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 06:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 197a43e15920cc5331d11f0cf3dde6a4 SHA-1: 885614ac387d1601773d92ad287a43d56c1a7ea4 SHA-256: 9da836f2a889c4dba5f72c6c4f1ce528304921cd922f157b4baf7ab2efef61ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://irlanc.ru/uplcv?utm_term=convert+pdf+to+pptx+adobe PDF link annotation
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/bemivatavotorobenawemiso.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/semanavenamobisasirop.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40ea78237---balizebagikofexenafipi.pdfIn PDF document text
    • https://securitydm.net/slicice/file/35045268475.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021071409133073499.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/ludunewuzidaxe.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/pakek.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f8ee1be35---dokewawaver.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161266d9e1b8dd---32188050262.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ebf61a17---gibapejukanukupimivagab.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/lh21v2tad6o7j6eus9orn77qoo/narozupi.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/kuporuxonenid.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/198d3d797005c160146cd87a316a00bb/23317172453.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/ritisaxevusavabowotexivi.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090635827c8d---vulisidusajuboluvonuka.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/nobelitikoxivopanaze.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/22195057146.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/gagexeb.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/79151302787.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/72431435295.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/cd5fe71fb961109cef67afa528ae5891/seroxe.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/kagoguzuwagukumos.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f022eea2---dunebikefufilewawisozon.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/malugufopivinozuvagagozom.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5e3014dc---wafudexuko.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e78e6a14ccd---6449576622.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2addb78785---jajamimakifesusogenunifur.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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 10524 bytes
SHA-256: 2a41a10938422e52e158740c0c2a0c645b1e9afd00570e87100c49471238ee0f
font_02_sfnt_off00010969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10969 18364 bytes
SHA-256: 94a18dca910e5c0dce6ab762d5af5960e1f636009091fcf3eb71e4325e6e988a

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