Malicious PDF — malware analysis report

Static analysis result for SHA-256 4768a4e07310a11e…

MALICIOUS

PDF

92.1 KB Created: 2021-06-26 08:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc24723fc12ddbda5389519039ba89ad SHA-1: bc99c545a16e0bc523acdefc54bbfbaa6f1a2769 SHA-256: 4768a4e07310a11eb935ca2cf953de6c0cc0417615557cac1faebe1bccd1edd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves directing users to potentially malicious URLs hosted on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://smidgel.ru/uplcv?utm_term=discipleship+in+the+church+today
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a89fb05b1---77084659593.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752d6d47817---86951244782.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16085fb3e619ab---daragesejaj.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/741950df04af7e019553f6714bc2bce0/xirolofuxidenevitobo.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/vmhlspcj46dhsp8uhbkmrh9ff3/66206523314.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/05ecd482f0402bf274d941cf0fcdc12b/wamos.pdf
    • http://zrdb-drogbud.pl/Upload/file/35556672510.pdf
    • https://citronel.com/userfiles/files/dijusanupaluvawosolaf.pdf
    • https://planet-for-events.de/userfiles/file/jamadowugosen.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb3da62e0---likexugibojusitedumes.pdf
    • http://ghalemdi.com/userfiles/file/vavevijegarunige.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5db8ea0a4c---xulab.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7a04972eb---97779679360.pdf
    • http://sam-global.info/files/file/59841238026.pdf
    • http://guojingmall.com/userfiles/file///56873467990.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c7819dc4---timem.pdf
    • https://cihangirhotel.com/upload/ckfinder/files/2598748571.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6186a04436---xusebusenezetudowizux.pdf
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/03naatau15d9eep20palkqla8f/63927541947.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/65f06006a5a46417a6c798f9f5d8c13d/kezesogevolabad.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jqdgdo6icokejp55if74aso5na/pefujezololufofi.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/5qjta8be9ui212iftfvscfvr63/didudasaxozin.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16073e11d5f64b---17024662179.pdf
    • http://www.anjhimayath.com/upload/file/kukibitenomisako.pdf
    • 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_off0001039b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039B 16792 bytes
font_01_sfnt_off00011bad.bin
ae2a124a97a3ef38edd8a91fc2d5ba35f4a6b2c70ab3014dc3daad81343ff1f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 17772 bytes
font_02_sfnt_off00014a38.bin
a0720f8792bc5ce0c59eac26e03b746f994cccf67fd154dda9e11282503c4b00
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A38 10828 bytes