Malicious PDF — malware analysis report

Static analysis result for SHA-256 16268020ed47211b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 11:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: feb60a6928ff8fd3443b97320bc3c76c SHA-1: 59e15263c81871ac3f06f393956737e2213c6ccf SHA-256: 16268020ed47211ba750943c845a5f661504ae7046c0b2ad0b3ee27a4a5171f0
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The presence of numerous external links, including those pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=gta+5+beta+android+download PDF link annotation
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/35955181735.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/govinalegagofu.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631809337.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/xajavegopu.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/xetezelajadafa.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/fibej.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d281fd6b0e---nefiped.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/31354247626.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/kuregopukupoza.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/ditezuzubekepitozuxab.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387b51dbf14---82689887788.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/15412470411.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3870df3a---poxojabevuvazeserutenesom.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e78e95f8b6b071b392295f9c3efc115d/61196636645.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/pisotofutoxu.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/65982369558.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/wazukorukadem.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/32102160679.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/tusefuzikujinuk.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613657174f81e---gajuzolazonibef.pdfIn PDF document text
    • http://tyextractor.com/d/files/35548528052.pdfIn PDF document text
    • http://chinahongji.com/d/files/76521380377.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/2761208925.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/zatejabilu.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_off0000d4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FD 16920 bytes
SHA-256: 3a934f6298fcb341a5aac2fc83684e88be2eda18b55964219b5a0436076b9d1e
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E3 10472 bytes
SHA-256: 41df45abecc356f480703730d84ca53540ba38fdebcffa8987926df4d40dd620

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