Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41077c211b9889b…

MALICIOUS

PDF

85.6 KB Created: 2021-06-28 17:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1dea8c9000a7bf71fff5512fa068c28c SHA-1: 1a7c22ef0921b14a48809882bdc2e3f045c16be1 SHA-256: f41077c211b9889bdae8e4f05da4f020d93495d504b07091f241895730b2a8ae
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, indicating an attempt to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab30a840f25---xulexijatu.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jecrg41a5b2egj79uqjpqmo2u6/jozamupivo.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078a60eed7e8---20638268912.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/49db41932bed8557c6b0c9c5fc9a7711/pajivaf.pdf
    • https://cambodiadriverservice.com/userfiles/file/55596964566.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ea6d9863fa891092ec5926e572c9fcc7/4660846952.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/4a3ed39729e65e8aa14c60d67e43e40e/38379531505.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hfk92vsiklptq3euathq620sch/31776349679.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb9c71a3c---6648285209.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/17fa50e0653b9130be3b3e963b7da2d8/35563727689.pdf
    • https://goodluckfishing.com/ckfinder/userfiles/files/mukanos.pdf
    • http://hyosangjo.com/userfiles/file/20210627040401.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/14ad92e9bfe00a5aff0d8a6c30733fd0/35469788403.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79a20d2d0a---posorisi.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16095ed69dc4fe---20315812727.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210518075311152301zw98ss.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a6fbb8246---memazakole.pdf
    • http://zge-led.com/luodan/images/userfiles/file/wibuzekem.pdf
    • https://clickkedai.com/userfiles/file/bonelad.pdf
    • http://langeline.com/ckeditor/upload/files/tirobapow.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b0345f59f70---lawogutomi.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kmg6arhqena8pcri0is6kubbvt/sesepofeg.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078356c5f739---53994194191.pdf
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/3272389945fe305c633d3cf274b290ce/nufumadaxabu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=famous+piano+duet+song
    • 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_off0000eb70.bin
ba8b8ac9b1ef6a16cee6fdd7ecbc55b98fb713e2f535a417e67615b8b9167872
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 10664 bytes
font_01_sfnt_off0001039f.bin
8074e39c1368fe853153aef12b1e2b07935c6cabba308f40c0d14b69c45d485f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 17480 bytes
font_02_sfnt_off00013130.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 16792 bytes