Malicious PDF — malware analysis report

Static analysis result for SHA-256 509ca8a732fd4759…

MALICIOUS

PDF

103.7 KB Created: 2021-07-21 18:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 698950e6ed9bfb9fe2f51ee00eebac7f SHA-1: 238961975fd91917d41f74a99d700649500c3821 SHA-256: 509ca8a732fd47598a3102e32def5dc2445473165a5de3a9fe72a822b7a47c1f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. The embedded URLs, such as http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb0d6473e0---35155821106.pdf, are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://duext.com/wp-content/plugins/super-forms/uploads/php/files/bbfcad1d04af6425997d6c9aa9fe5864/jelegiwawuwapevomexesize.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dc12cb3d7---91590212720.pdf
    • http://littlepearlbooks.in/data/eimages/file/26362215107.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/e8c04f24cc0dba735ead0fa81704e4a2/74766408415.pdf
    • https://havadisname.com/upload/ckfinder/files/89809987193.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/47744016650.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/ef6eba58a6b6e133d1b6a5efcb0944ff/zugujojosadorewebixu.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bd04e419537---73070670120.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/18665847014.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69294e86b---57788973386.pdf
    • http://palyavalaszto.hu/teszt/upload/file/pedobikamasamedimipep.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84d9b443d---zugizujokipegux.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607595e65af66---newif.pdf
    • http://sunnysolutions.it/uploads/assets/file/nemapo.pdf
    • http://applecentervn.com/uploads/image/files/pefiralakapuvebafodigeb.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c781c45b5af---sufivevutimoronakovit.pdf
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/jolodiselufikajel.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca07452442---dodisabarofixemukufa.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1455006a65e97e3934c66fd51a43d5e1/lewubakokemewep.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/b7856ad7ccf7b69a5f1a091b33abb50d/28097570439.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ddb0d6473e0---35155821106.pdf
    • https://personnelcle.com/userfiles/file/rogiginem.pdf
    • http://dieta-plus.pl/userfiles/file/rugadajarewu.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/rakojijegu.pdf
    • http://solamsys.com/userData/board/file/budabidoxawawukome.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=that+time+i+got+reincarnated+as+a+slime+season+2+ep
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f027.bin
af81a677a54d7899a6ef0ff93e0bc9af6bee0f8d2e099e8b3ae83a0258c9ed60
pdf-font-stream PDF embedded font (sfnt) at offset 0xF027 19432 bytes
font_01_sfnt_off00012afe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 16792 bytes
font_02_sfnt_off00014315.bin
94a93d4be126fc69a5f3a490c87e286ab83f17c2aacccf852da72f6e6a619019
pdf-font-stream PDF embedded font (sfnt) at offset 0x14315 11044 bytes
font_03_sfnt_off00015c6a.bin
5b569f688fe016e015f4dd980a847caf6304b076924ed95245fd52df7ddedb14
pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6A 23180 bytes