Malicious PDF — malware analysis report

Static analysis result for SHA-256 02078693bf6f4c7b…

MALICIOUS

PDF

88.5 KB Created: 2021-08-02 23:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c7e6407d519d0a8664a7c118f634b1b SHA-1: dbfed07ff2d3e2cfdabb780a6e71ef6ba0ac6d9e SHA-256: 02078693bf6f4c7b1eb6d3da860cb881e9e41bb70262fa3f7f6bf0e6015a7b81
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ohmytour.kr/FileData/ckfinder/files/20210707_0FE5486D944FF541.pdf In PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/veram.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/72818022241.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/27/55816845323.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210705161842.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16075af3579478---54206636380.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/80679526083.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/78521602662.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f321ba563---78245406094.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/newodag.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/59613273752.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9a8ec1e5---botugawuwodikatafukeraz.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///nubebafilujafe.pdfIn PDF document text
    • https://kildevangen.dk/files/kodotizopaxukejimigo.pdfIn PDF document text
    • http://scro.ru/pic/file/nefagefu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9d86adcbb534d115d7d9f0681247dfa2/94385458550.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/wosejofuteraduw.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ig5n4bi83l0b41vamg307krcd4/zajusasig.pdfIn PDF document text
    • http://gibisch.org/files/files/34097814903.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9e379cf33f0b8824e9bd14a6ccd49277/jubolob.pdfIn PDF document text
    • https://unicornccc.com/ckfinder/userfiles/files/janirewowedij.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/22218184673.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=descargar+publisher+gratis+sin+clave+de+productoPDF 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_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 17112 bytes
SHA-256: 2b95bd224506e968b19616338971a25096dd6dfbda208244f315991fca8078aa
font_01_sfnt_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001376a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1376A 11100 bytes
SHA-256: c5e8f3e6f789bf035a86e01d46fc1f04a3a6a91409e3bc1eb2bc2420a68ab0f3

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