Malicious PDF — malware analysis report

Static analysis result for SHA-256 87499d69a6a13efb…

MALICIOUS

PDF

75.6 KB Created: 2021-09-07 03:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7832a6b5309ab7d64f55be483a5081c8 SHA-1: 89af6e6055a20e9af4e85f0441ae8972ed4b0036 SHA-256: 87499d69a6a13efb31e65e4cb408106dca7f52a1259e8dc73d7ed0b2fbbbf750
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, suggesting a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing further malicious content or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://tolgyesvolgy.hu/userfiles/file/23271655388.pdf In PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1611424ed97a18---xedof.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091d7cb442ae---togejejikoserunifefi.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a065fb6e800---vakuxagono.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/razukiwan.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/68544917357.pdfIn PDF document text
    • http://jucal.es/images/file/jidepupanizoz.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c866d1135---mitisokasuxesopoweni.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/rokapegepepewowifezopaba.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7fa6966c50239825f72f89a5a5f1462f/vugawilumoxub.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///gofatudu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0aje8n88mlg9m60qtjeieebn32/98145216959.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3d2b5c105---kuzotufi.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/sufovijidapuzibu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/91d6d0fbf916cf3137e6deb6fc525899/gukavoxojigenetaxitinib.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e9012e489---ketidi.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/sekixofolususag.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/kivejawovufeb.pdfIn PDF document text
    • https://norservis.cz/files/files/vumojezebux.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/risuwalulujewuxe.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/15803617666.pdfIn PDF document text
    • http://nprofit.hk/userfiles/xuwovujowusikaguwus.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/tafisasusoraxuzuvoj.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738cd77c032---viwamopotidot.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/gowiginikenejaw.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca030d8198a---fogufuvenadaxeralusawe.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc8c9312b48---sotabokazumukuzomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=eaton+evolution+s+3000+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC226 10612 bytes
SHA-256: b2287dd9ede4bc604dd72a1482c8ea974f338790466e12bf95b710b62f9f8db7
font_01_sfnt_off0000da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 17792 bytes
SHA-256: 23c47a2ff29fb964bb14e7cb1a44b6b386d669eac81a3a44696015fb0d5a8791
font_02_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1