Malicious PDF — malware analysis report

Static analysis result for SHA-256 30a7ff25ca6418b0…

MALICIOUS

PDF

83.2 KB Created: 2021-06-26 06:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 81c7505402ecb6941ed3c6f87bfaf0df SHA-1: 8d6e539d8943a42cee935bf615d1b2eb55c8f71c SHA-256: 30a7ff25ca6418b045ebe569b716a76c245816c9f6ca17924b8a90f810cc6483
156 Risk Score

Malware Insights

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

This PDF file contains a link farm, with numerous URLs pointing to compromised WordPress upload storage and disposable hosting. The presence of these links, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool, rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79fa15f8b---vowakadijewodu.pdf In PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/925ede3bd875a89df0ecc7cf2aaf4db9/rulipozaxuxatedowinun.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c1c9e5e2c---77235941159.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///26152723903.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/makeximevuwuziligomosik.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/90990773378.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/veluga.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af77edf3ada---jaredaboxufuxodoto.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/sarofum.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/2971248666.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/sefixikupineli.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dsgono8153at48j2cvf0b5nr60/83733931296.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/39275028857.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077d53d867a0---xodiwexabuxuvukotik.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c54bd0521f---wuxaxunelevo.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/mobukisirenegudiraf.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079d828323f1---66740911154.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ded956759---sabake.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/c59bnsgu61rmuh6uanvndbdou4/59922125549.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb857c01d0---34773596429.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607277fe37f37---25075030293.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/47a91b9c1bf8e4f88a7dee297ea6537a/14989412543.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b79c29d591f---10661925723.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5efad522f---79007946296.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/3423631166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pdf+to+excel+word+converter+free+downloadPDF 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_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 10464 bytes
SHA-256: 547f77bd632848ca382750c9521ac29fff5035c897dd3e9eaf6d54a5ecbae760
font_02_sfnt_off0001123f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123F 17280 bytes
SHA-256: 933c1a0c19416761d8a9dda218b4c3f1fb539f8072e5de25db2bc4aea2531b5f

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