Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e85e5e138e7a83…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 06:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 83842d21095c9ab1374d103e0c7b8fff SHA-1: 36c6a24931a197ff56165b212aac7ab950b0cb92 SHA-256: b6e85e5e138e7a837014d835f29f5f0974a09a325f2f1435a71571d21ee3a727
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, embedding numerous URLs that point to potentially compromised websites and disposable hosting. These links likely serve to redirect the user to a malicious site or download a secondary payload, aligning with a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842afa826b---79643197044.pdf In PDF document text
    • http://banghetretruc.com/media/ftp/file/52257083435.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/4604591486.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c1121bdebf277961b88920ef961a24ba/95808527686.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f853651a---fifuxorakebazajuxawuwigob.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/28357319830.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/8694554552.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40512749702.pdfIn PDF document text
    • http://naso10.com/userData/board/file/xaduzimapugagemopawurovox.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/91026008415.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1f5e0658e38f02eb67832e407873a67f/bifevepaxitapikekij.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/63608334779.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/32028244506.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/ginusededupekukuz.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/98587519465.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116bd5271ca7---49506369707.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076d602d5473---52732427535.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/zitikizulimejanakeromuv.pdfIn PDF document text
    • http://drshapard.com/clients/73598/File/zorog.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/36983841902.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/wifesubotatuxuzugub.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/1t6oi8qehusggb2ubo8sm8cl60/68333269287.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823516a6cf7---fidewofuv.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/fonazewofukinop.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/98588309724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=solar+eclipse+today+timings+in+indiaPDF 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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 17148 bytes
SHA-256: 85546b4eafb28fdba339e24e96649b6fe619ad937f6b3f8cf24a89944d2624b7
font_02_sfnt_off0001268f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268F 11048 bytes
SHA-256: 664f516b570cbc700175cb3d81b2e5b348fa0fe88c3c124effc813c44efe4ff2

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