Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8eca559e6be4d9b…

MALICIOUS

PDF

93.5 KB Created: 2021-08-19 11:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e9fe0fc9482f90b15ba2d4fd7bb3547 SHA-1: f3af0e78bfa6a767ee0914d923a19f628c7a6808 SHA-256: d8eca559e6be4d9b5cee616372881382b363f345a4a2f92ce9d1193856e0cf4c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites hosting PDF files. This suggests a phishing or malicious redirection scheme, likely intended to lure users to malicious content or exploit kits. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8f9c0a5e5dcfab5c72823c4ac92f1046/rasobeviwitevekol.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/56053383239.pdf
    • https://hobbes-group.com/upload/files/17137817564.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/188c98c37b6191a9eaa7983cf8c84376/rujirodexilamuno.pdf
    • https://rivieresoceanie.com/userfiles/file/lunajajavixudutuzejupezi.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d181134280---mejesilalov.pdf
    • https://kingdomofgodmn.org/userfiles/files/95640526694.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d472f343240---korubafotilem.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b831f3e3a7---guravuwufagag.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160785294c477b---79687990052.pdf
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/garetufelalatorisisaf.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a1638ef5ea556349efa9bf72c145bd92/23268928437.pdf
    • http://ipllaser.in/uploads/49600545058.pdf
    • https://linhngapt.vn/upload/files/34842823364.pdf
    • http://wallsfamily1912.com/clients/876683/File/zuperavusepupuxobix.pdf
    • https://realxenon.ru/uploads/files/bimaga.pdf
    • http://nsfeed.com/_UploadFile/Images/file/jabokusaba.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/84vp2v4e3eog04l7srrsjt5rt4/bisaluribezudob.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5d474326c2984bfb7bf712d7525d3343/39124726051.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/aff7ca87231785cd679da353f4aa4beb/29445200883.pdf
    • http://iphysiology.ru/upload/folojusopotiful.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087687608eb7---zimapusagojaporeb.pdf
    • http://abacusnancy.com/userfiles/file/panoxuroduni.pdf
    • https://himalmanpower.com/ckfinder/userfiles/files/19657718615.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+update+bose+soundlink+mini+1
    • 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_off00010704.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 16792 bytes
font_01_sfnt_off00011f1b.bin
077d4160a919ccacaf7bfef20dfaa75d5746715a9a6a46fba7f867c4b98ed232
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1B 10912 bytes
font_02_sfnt_off0001382a.bin
058912cf6ba2ecf9326d15e24f4ef2440e0861aea3633af81555b505f3bd0385
pdf-font-stream PDF embedded font (sfnt) at offset 0x1382A 18476 bytes