Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab70390c1a373e88…

MALICIOUS

PDF

76.9 KB Created: 2021-08-09 10:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a62b868e91a705ea67272a8430f162e SHA-1: 248c4283d2fd6d25359415d35571061fb5726376 SHA-256: ab70390c1a373e88cc6e89909ecdd8f5adee53d3e5417dc3a7bd4d73b410691c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads and disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The presence of these links suggests an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/39ff0c5d234ae30f64acd57895891a61/gitetewitesidavekifux.pdf In PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607330355b552---mubelukiz.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a69cf873e4d---7880701714.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/vavet.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d2ae2c5968a74542bd0340d73fa90922/xelakuw.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089b16ae4434---pijafoduget.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16110a24a1d692---nibekedufige.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/furejezoxijenula.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/16e27e2e1228f4aad2f2fbe35b442aa0/jozotosaginelut.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/50joudbaqeu3l23gv536t9u31e/busuzolulafimuri.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/85826619035.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/4556997661.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b1e2d73151ec36468c4555023053bed3/ramevalofekevof.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/30123416922.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addc0e5ad57---91333953315.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6905d459eb037a6c797765ec11e9ad3d/ruvudafigan.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22827b26d4---wabefafijawodakavaj.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/90497299429.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/1f203e5138f63f9ccaef18c9762bb646/79912390232.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/dafinimezepenupu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/tovatifikuxel.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607657cb77d62---jozebizizagav.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882ded91beb---61577613777.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/9584183948.pdfIn PDF document text
    • https://go2germany.ru/files/file/wolaxesufotakal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=feliz+navidad+lyrics+and+chords+in+dPDF 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_off0000ca00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA00 16544 bytes
SHA-256: 203e9c3608758992127dabeefa9a47488b67e1c47d4cd6bc412be83ff1181ef1
font_01_sfnt_off0000f4b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B6 10584 bytes
SHA-256: 5eb51127b14b1bd624a7687ad1c6ed2ef2ce8987f05a949816cacbf5020715c0
font_02_sfnt_off00010cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1