Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6487d5652afbc4…

MALICIOUS

PDF

80.0 KB Created: 2021-06-09 00:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dfad3fa7fae4585f58bb33f244bafc9b SHA-1: 825bf120cbc29ea07b09b5ca016d0b9aff584f32 SHA-256: ae6487d5652afbc4e6605764af8aa0ad6e59d7fef82f9e5c0ed0b95eb2909ad0
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The document body, though partially corrupted, indicates a lure related to 'reconcile a bank statement worksheet answers', likely to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=3+2+reconcile+a+bank+statement+worksheet+answers PDF link annotation
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/gjobhavbhcslescntt8np62bgs/potoboto.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607823e009e5e---57531876407.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/19fb8c7d375eba27f2513ffd183f495c/pafeg.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/sifoxubarajekuve.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/e5ca97a153d326dbe203a176d3e811cd/17050646210.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/kedojevimamotolovelorip.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/tbb59t6dgac3hu2m28114osf68/tonowukivedigaborulemaful.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e68d94a532e358dee97cb329234fbee3/98955635313.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ebaea62c1---zelirenutivamupi.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/23526205093.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/gubulapum.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file/%5C/43636953456.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/76014761931.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/r6evcm18qe680auap8o3qfh0jl/22492377861.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d38700b6ca7250366ae4befcb1f57d23/76446426195.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 1768 bytes
SHA-256: 4fe1f96ba8db5cf35ca47cddaf067669eaebb9c038fc61eabfa1f5836d0fc525
font_01_sfnt_off00010906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10906 5324 bytes
SHA-256: f3c542b53c8d75b2db6991d9b78c9be1b7635032e154976a9b81bf41add046e8
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 11208 bytes
SHA-256: 98909fbb3e135007d2e8b623e29364d9a4c1d6eb28447aaebfbd6d3fc688b4a5

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