Malicious PDF — malware analysis report

Static analysis result for SHA-256 2197dbd90b48541a…

MALICIOUS

PDF

98.0 KB Created: 2021-08-11 20:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 969f4085a2a34bb4bd4ffe8d1956c7f0 SHA-1: 15f83c545abdeeae827cc9eb73fad0c8ea55258e SHA-256: 2197dbd90b48541aa3704c131fa5a823588f0d586a71c3de3d4b0d847d10444d
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 as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, directing users to numerous compromised websites and potentially malicious PDF files hosted on various domains. The presence of multiple external URIs and compromised CMS upload links indicates a clear intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://smidgel.ru/uplcv?utm_term=proverbs+31+woman+bible+study+pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af6ef91d725---46764930688.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/boc5v15mdifbr0c0qbanc6t0qo/13487630004.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c375fee1---kowidog.pdf
    • https://andana.us/files/files/jabun.pdf
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/68405577915.pdf
    • http://haozuowenwang.com/imagefiles/file/4469025933.pdf
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/36369367898.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/545d23a14ac3bcd87c020cf1e13f8557/weremoluj.pdf
    • http://polymer-optix.de/userfiles/file/rumovagudagumegetug.pdf
    • http://chipublichouse.com/ckfinder/userfiles/files/nukilifevifixejonerot.pdf
    • https://nnt52.ru/userfiles/file/84676911275.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a3356cb9ad4---83755291159.pdf
    • https://sesconbs.org.br/ckfinder/userfiles/files/73525954797.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f85496332d---bokezevedelafukebunopani.pdf
    • http://oecschool.com/userfiles/file/wizowezefumejexafisude.pdf
    • https://directorvincentchow.com/fck_filemanager_upload/file/rezakapitogubekofopukex.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085371ba3ec9---jevumu.pdf
    • http://klpa.net/userData/board/file/bufimibegajetir.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/84357ddb54ba72f01ee128fac3a589de/96425606867.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/bk399ipd2ut5ja2o4n0tjsn6e4/valamuga.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d98bc303ca9---dalapakobomeniviture.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011888.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11888 16792 bytes
font_01_sfnt_off0001309f.bin
6649e43f160dcfde4692e89431df4ee798ce35669d9312d7644893e6b52377f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1309F 11388 bytes
font_02_sfnt_off00014b61.bin
93643d4f7fbff8a867a79ddb8fa656f5262eb4d35620b7117d2a7776c765a22f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B61 17700 bytes