Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d0a213bf272e06…

MALICIOUS

PDF

72.2 KB Created: 2021-06-08 22:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e7658c1a57bdd500778f5a9ad4a7daa SHA-1: 7c5934fd7ce7ff695cc2494ac9a7126aebe4f7b4 SHA-256: 84d0a213bf272e0699f0a14fa85ab5ad343e7149d67b77906a23961ede67bc0a
154 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on external link distribution, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7662

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://chcial.ru/uplcv?utm_term=skam+s1+ep+1
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/apn59lnjk751lb4pvmc4o1t6bc/42495272106.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f64788425eb6e98b0c415ecf604ca581/sexepopij.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083a55f91db1---wasebumufemafoxularafik.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609b35045dc5b---75395328217.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/791ef5927a4117e148e23af4c9b71cec/83469574288.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/q40n775br2sfbc5ourh7fh9jrp/sadotufuxizezikug.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/jjqhdkpogh5aifchnvruvcsg6n/kabaduzuwurokededujukoj.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1011i264mu70h0a20tk6q1dg32/zigimumevuvikemedi.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ade503a5d---zudagejesak.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ac03a0fa82af60cac72d09b4c4bec4eb/wefanuzilukegama.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/jeggqcagemapnvs3ipdvcmshp3/povobofokepip.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/56a625a3531bb5228a7662a619e986ae/20409191993.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc222c9a5---wolulakobizonuzibe.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7ff4970c1---tewalafobon.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa04656d352---zuruxudisud.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6233464f52a8589f1a2915f0f259ffb9/69461002562.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d91c480c---86386274509.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f6.bin
da3800ac57b855bb9bd000fd2e861266048c46e0c292921d9efabe67012b8034		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 2908 bytes
font_01_sfnt_off0000ec56.bin
2accb6a4c3b7b1e1aa332fccb7eb2eedbe56b8287d099e4d5aa3e9d318529638		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 5056 bytes

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