Malicious PDF — malware analysis report

Static analysis result for SHA-256 5346a73e96d4fafe…

MALICIOUS

PDF

77.7 KB Created: 2021-07-09 05:55:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 136d0a7cb3704e44f7c512ff8b076ae3 SHA-1: cdc76dab890abc35b96310f1d0e13511e4bea14e SHA-256: 5346a73e96d4fafebb8465ee77b8d15a3b8e53f55f62d8e55a9ccaf217e3a3cd
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file was detected by ClamAV as Pdf.Phishing.Trojan. Static analysis revealed it contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites. This suggests a phishing or SEO poisoning campaign, where the ultimate goal is likely to lure users to malicious content or exploit kits via these linked PDFs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4752

Heuristics 5

  • 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
  • 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://umrllc.com/userfiles/files/rijasonezubiposejojulafen.pdf In PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/xuvikojup.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8ad85f157---kupejerijagevujuvesoro.pdfIn PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/26954659602.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/07ee86b420aa3774a564a661915cc2f9/91191120285.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/u33qeimbdn5nqg8mg34clvbfhf/biwoduberux.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/h26jt3k7fif7akuodsm36dgj57/taxil.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/56792777367.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/105ceef98d035d7d9e174a0d6b4fc7b8/3914708118.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/smofe1qhf4sov52dvil9fuds9f/zowurezofubumi.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/zukofadolujinus.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/3018076394.pdfIn PDF document text
    • https://ikima.fr/uploads/file/18105840765.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9553324f---86879157498.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64a473587---49159251566.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/baxopolopumi.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608694ea10cf3---foliketibisubupezowunaz.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5754ba895---65606997418.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160825219d1fba---64362108148.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082a357b7c58---90886890940.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/mokapaxabebekos.pdfIn PDF document text
    • http://strandedtattoo.net/file/tesidopivukipiwewoselofuk.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/39170157680.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bec4786387a7db3d223f3281e00717d9/2381338013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=low+hct+count+indicatesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 10464 bytes
SHA-256: 2499450ab22538fe6610787a273dbf9267046cead46fa671bb91f190a6f4d83d