Malicious PDF — malware analysis report

Static analysis result for SHA-256 37cdf44a0bddcba8…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 01:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a94de8b4dbdadb656b9cb288e5b979df SHA-1: 50c5ec3aa3ec6b7397ba54f9a9de4dd48148a4b8 SHA-256: 37cdf44a0bddcba8c185d92ea83c888520b7d720d645d9a47fc7acc81411acdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and numerous URLs strongly suggest it's used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://oniceh.ru/uplcv?utm_term=naruto+mugen+nzc+apk PDF link annotation
    • https://mn-lawfirm.com/box/userfiles/file/32390006552.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/89946154526.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/ruxezi.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/25481786611.pdfIn PDF document text
    • http://byecook.com/ckupload/files/sopizofatowelefataf.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/59309183958.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/63119793286.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/nadujopebevaj.pdfIn PDF document text
    • http://cellfruits.com/ckfinder/userfiles/files/nenikomavapowovilokorupo.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373b390bbf5---liwitimudejum.pdfIn PDF document text
    • http://ippon.lv/uploads/File/luruzap.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/nerosikasaxazog.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/87510434317.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/161301f2688573---45476763509.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/28098632188.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/6797677924.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/josem.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/jorozowo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16140488f07d98---pimapereboviletesereli.pdfIn PDF document text
    • http://wawa757.com/uploads/files/zakabux.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/35592240213.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/lajap.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/wewun.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac6ca5fec7---71719133673.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/zobizokasop.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/nobanapi.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_off0000d331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD331 18480 bytes
SHA-256: 01963498d43f6fd0852e07f71eaa9b621386631ad8e6c0b7b5d7172e77f586ab
font_01_sfnt_off0001036f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 10640 bytes
SHA-256: fb347b3e58dff6ecfa856f6e18517e07bea88c776a4d3b8923da529a6f027701

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