Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b39ca771fa3f95…

MALICIOUS

PDF

85.5 KB Created: 2021-07-18 06:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ffd9aadb8ab159d43ffc83fb8cc0b76c SHA-1: 7d7477404fa38fcc5a855c897591c8fdc8deff43 SHA-256: 63b39ca771fa3f95e1681c802fdb4be21034a96d65da585333dd508de227bd99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of multiple external links suggests an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/rgma65da4d0kc79qr06dta4hdb/83781297729.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c4dec8a0621---23244856440.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/23961773669.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/jibitomadikexew.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/668a0aa0db3c8d6e7a92980a7b3abba6/falewogiveme.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/fpfs28vu54brjhuvtn00h9ld3a/rijimodesuduxosejidasiw.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082775d4b2de---71733443875.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/14262036039.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f1be51a0---48154425795.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d624fc5fa1---21693976000.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/91934384327.pdfIn PDF document text
    • https://chptravel.ir/data/file/36499412987.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe3b06811e---nenesupepakukinila.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/87521254191.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7cd87ad792ce613d94507a6a93803f16/nuwonumidejum.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/sekuwuvetixivez.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/qgic6s596qlst6v3algcr6rbt6/lamameduvifo.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/xadexe.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fa1431e4ef5d20921e31dc8ba15f1721/wawarisedotaxo.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/30786075730.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///38026900695.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/linixogevofusibifaninidu.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665be2b94a---21479896663.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/butor.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/32871424572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=meat+with+gravyPDF 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_off0000ec6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6D 17732 bytes
SHA-256: e949eb9489c165fd132cc54825d4dc1f5abed9171054a3a69cb2f2be15248f6d
font_01_sfnt_off000119c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D8 10208 bytes
SHA-256: ec57118c1305c3b9fa264cb3809343a1b935b35aaec2876e84b12ec54cc78b37