Malicious PDF — malware analysis report

Static analysis result for SHA-256 a58bf7ee18cdf29c…

MALICIOUS

PDF

91.4 KB Created: 2021-09-14 10:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c521f94f5044a325b95f68c14ff134e5 SHA-1: 42a3ce5b026cd745958d850aec9455e4f3cfe285 SHA-256: a58bf7ee18cdf29cafa6329427ef00b1dfe64cb3c2a7ba24502de85e2767a687
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

Heuristics 6

  • 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
  • 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://philabc.ru/uplcv?utm_term=android+messaging+application PDF link annotation
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c2b0376f4---95579784988.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/106f50f3898c3abc0be51367ab1a158a/99929557485.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/5635462036.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/85485160024.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/wojoxarojitazabir.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/sevenorobozizakebejizogor.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/gojaxuwezovuben.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/23641748960.pdfIn PDF document text
    • http://balalajka.nu/media/17657405482.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/20961452040.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/verowumijipibiji.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcb936e390---28711153559.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/54338779232.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/xajogegorirenexewow.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/ripamufotexaxali.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210910065924.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/62266271773.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/92239684581.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/71781094658.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109060656223939.pdfIn PDF document text
    • http://dentherapia.hu/files/file/27148200616.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/57877257076.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/bavipulamejakef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313bcf19466---94578328102.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/33217560981.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b925d825---gidipazipezogoz.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210901_192735.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_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 17932 bytes
SHA-256: b6eb5c0702a8b9bb49a66df68cd2a818769c00d301310ed576c9954b34377a2d
font_01_sfnt_off00012ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F0 10836 bytes
SHA-256: 9ee1b5bbeab2e94a8cab64eb79901f9e9e74f081b651a5ab4083707b4eea6492

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