Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4aee1787a238ec…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 18:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e27fa927366e4d398e2d94e3eb2fd010 SHA-1: f3c776ff410f00f1a6d7d99413cd6736bddd1e92 SHA-256: 7b4aee1787a238ec9fa33c955af2a8c2db9fb7f4d50bebd5079322a752640469
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS uploads, indicating a potential distribution point for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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
  • 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://axi-hohenstein.de/userfiles/file/bubaluzulirevirarukofi.pdf In PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zitapix.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ifj9ugmm0cob19qqk3e9ob1e4/41969314915.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/sujubodunevedebosokipo.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/nasetixodozat.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/32420208178.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/43166748087.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/bexajomo.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/dalevizuroboxuvujikosed.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/dp5bhvsh06np4q8jpupidfaf5f/jizukewudek.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/8077439300.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11110736680.pdfIn PDF document text
    • http://industra.sk/userfiles/file/22713685205.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/161328df13b126---32643000582.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/sulux.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/20157909723.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/11461381122.pdfIn PDF document text
    • http://dsraxys.com/uploads/lokokavibowuleluginisew.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/66730425213.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/44240592715.pdfIn PDF document text
    • http://jaqalsports.com/files/file/22924600385.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/43079641003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=minecraft+wiki+sword+enchantmentsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC67F 18092 bytes
SHA-256: 2c702a4ce8dcb0cb935a787b8908309c1bb0ca0c55b6069aae0917f2874854e9
font_01_sfnt_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 10868 bytes
SHA-256: 1f36bbd9a019a9be44a4906732ce5f4fc66be979a9a3b27311c17bd26d31f362
font_02_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1