Malicious PDF — malware analysis report

Static analysis result for SHA-256 9835c34e41edecc6…

MALICIOUS

PDF

96.0 KB Created: 2021-09-11 10:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ff87d3469bef28f2523a70a06c4574f SHA-1: 7b7de270b55e01aaad45b436f9b0c25440fd43b3 SHA-256: 9835c34e41edecc6015f25e5730be386430bc8987f6d46a033d78e73cdf10f2a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3428

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://drafthe.ru/uplcv?utm_term=instagram+free+followers+trial+50 PDF link annotation
    • https://alistairmills.com/ckfinder/userfiles/files/42897221071.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/84733824498.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109111116554785.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613437469034f---deledo.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109061018398643.pdfIn PDF document text
    • http://rurisnet.org/images/file/87161467890.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/popijobimanu.pdfIn PDF document text
    • http://ks-system.co.uk/ckfinder/userfiles/files/65447819542.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/83526427476.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/37485027083.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/pojuzajupomuvovimisikuro.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/20864629640.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7b99370a2---33412131707.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3f1c400ef28ee87fde5e87de42ad9ccc/17952984847.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/bixifetekefipataj.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/83118544968.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/15376539210.pdfIn PDF document text
    • http://uhorder.com/upload/files/29063042640.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/70s1l7q0eg66hg8t5m6bhurejk/digele.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/xajufowabitamidimejujiv.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/96172197304.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/13955415815.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/dizozamefuxano.pdfIn 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_off00012259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12259 17692 bytes
SHA-256: 8d0a2678ea8d18eabd1bdcd278feb1b90286b14f96b039d4294471b14f2ad374
font_01_sfnt_off00015088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001689f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1689F 10852 bytes
SHA-256: 107913ee34d5d2ca39e687169d66340c589fabd903e773ab5c04428be37e3313

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