Malicious PDF — malware analysis report

Static analysis result for SHA-256 f43945034615f41a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 17:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 626480f4bbefcf733c1e9230a017f51f SHA-1: bb4de6f57cfa9508115c9e8192ccea2b6899e0c0 SHA-256: f43945034615f41aebd3e05e8440ad50d82120b3a5837f4ccb42898a0aeee92f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of creating numerous small link farms on disposable hosting, suggesting an attempt to obscure the true malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=2+player+games+online+unblocked PDF link annotation
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614163394312d---pibafazejo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vvdq0h6ulcjqsifv0f8nj54n4f/jisixagibarokagosoted.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f74q471rc7vijknnkvhg39pk57/xipekozuxapuxutegab.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/38477375438.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/71920956701.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/d59bb5126918959e548b3e4b9487bbde/59228382209.pdfIn PDF document text
    • http://opsir.eu/files/file/69811522905.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/kizokakowizal.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/pisit.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2a7ba4302---nigoxivaxinoguge.pdfIn PDF document text
    • http://berbun.com/user_img/file/dunaredufaxisizisojofof.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2fdba05c7a2cc0df52c93d8308075dad/nedawovorokuxojepirusoji.pdfIn PDF document text
    • http://giga.sk/storage/file/fiwowenamuti.pdfIn PDF document text
    • http://oodow.cn/upload/file/210913225015551077udgeo6xyrs5r.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/6097940008.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/gapetepawalisutem.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/delitufilovelokomenu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161487dcb6d50d---tufibolutimowijizejonilem.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eafd6c9403---50382273061.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/16689976442.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139d39471585---jisasafup.pdfIn PDF document text
    • https://xn--q3cceuw0c6ab0d2ii.com/upload_file/files/vuwemikajazukobarimewur.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/dogikeluwuseduzi.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614401594990e---tobenepifajenopetifepizo.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_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 11228 bytes
SHA-256: 43657bd834d3fb867e4da825522e2152c5bbe18e3509aadd43a40e4c79ee98ca
font_01_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 17172 bytes
SHA-256: 11a58f036b3a6116ee470137a748e3d6269c47fb6143fcaa3df5b5eb527f734e

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