Malicious PDF — malware analysis report

Static analysis result for SHA-256 8230c9baa2402c31…

MALICIOUS

PDF

201.2 KB Created: 2021-06-28 11:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 329887d648a226484cb47a418e2bcb38 SHA-1: f356dfd8475e08c8febad6b396e4abda0071461c SHA-256: 8230c9baa2402c319665e035dd4dba1cd175ea4cab5dcd2be6d97a74f5354e7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains numerous links to compromised WordPress sites, likely serving as a link farm to distribute further malicious content. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to redirect users to these compromised hosts to download additional malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9692

Heuristics 5

  • 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.
  • 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://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075284781f28---gajajudifixotonuse.pdf In PDF document text
    • http://cortabellanews.com/userimages/tupawub.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/fitom.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/fizufijibatujolimum.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/99a3cf5bdcaf0421714d080436ff74b1/lezofomibeletoz.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946dad7713e---17800445814.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bnjjbbbdus2p10b1mpupatvru4/deduwozipamozusone.pdfIn PDF document text
    • https://lysgaards.com/ckfinder/userfiles/files/11011697383.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/25795009387.pdfIn PDF document text
    • https://ovalpolycoats.com/media/75319022693.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/xabazukemipuseraxib.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770ee365a55---92375693134.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e17c2ffae---luridukarexasojirevo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/97c280454565e5e8baed21a912cdad02/datuwovabetodini.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/23807839435.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/3224061eaa9ee94b5a4d7aa8abda1313/xasimejipuselodu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc21bc770b---lufeburesepijefa.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/vumomazuw.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/avp7np3rjnr2arbitll9l7v7h6/37840711232.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8591c245---21408984008.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63d2d4ac6---5356930388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=protective+enchantments+harry+potterPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002906e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2906E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002a885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A885 10772 bytes
SHA-256: 31e8d13c736287e1da8f6a345a6456301d92b307d8967be4ee61a0f9f509849a
font_02_sfnt_off0002c0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C0FE 952 bytes
SHA-256: 08db45c348b042e5b6543e4ded476fd90fdf5dbe5fa207d19202d8b4f408f94b
font_03_sfnt_off0002c818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C818 21072 bytes
SHA-256: 0f88bec851af6563ace8be3090c64e7c6304bfee24bc963b68699c4a6c9281bb
font_04_sfnt_off0002feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEDA 16464 bytes
SHA-256: b20581579d198702f164798892cff50ff49977bd2f875329355da98e78e27e52

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