Malicious PDF — malware analysis report

Static analysis result for SHA-256 879333b66e71e748…

MALICIOUS

PDF

87.5 KB Created: 2021-09-07 06:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3878740fb4f5515de63a807d3f4dda12 SHA-1: aa32f945ff9f69321d8b9d7e70be1b793ccad27c SHA-256: 879333b66e71e748aea36b744d6b5bc5eec65cb95571ab66eb48d08297d540f6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pixomot.ru/uplcv?utm_term=effective+academic+writing+book+pdf PDF link annotation
    • https://progin.swiss/ckfinder/userfiles/files/lekibebumimozez.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/57f81d0e90e02797d7ea0fb1bf07d281/lofolemijasovagoliri.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/72409237279.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609da25a7cb6d---68356753036.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/kirav.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nerexunaneke.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/refikitabowe.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/3ff7492901a90b06d1753351de51bf48/89845845655.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/18315546977.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/97372713139.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa5d563bed---76608922545.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c98ed7f4d5---mukigoxori.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/gefefid.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/5161660786.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/84334070632.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/vezuwisuditowukabuduk.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608f62794afb0---67280921497.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c19d5fa78---14173729526.pdfIn PDF document text
    • https://alkoplast.rs/files/32166928020.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/dulimakezatagepo.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/zafasugomobowugesijuve.pdfIn PDF document text
    • http://hms31.ru/img/file/29591702192.pdfIn PDF document text
    • https://bagstyle.uz/images/file/97252727002.pdfIn PDF document text
    • http://unityproductions.com/upload/files/titojomaxidajakugatekaje.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ej5rlkopjrh1ahfepmnn8jdqo1/joliwutovafabitibafu.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7bec393e6---daxelafajebesibixefa.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_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 11116 bytes
SHA-256: 5b98413d8726f1ac5cd540fc53fad1104a2ff90acce7e33c22efa65fccf054a5
font_02_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 18432 bytes
SHA-256: 7ab07156d7130009ba20e4b918499ce0bfe121107f4566993d4aa23ed9e71d13

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