Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8bc87d1dc31bc1…

MALICIOUS

PDF

86.0 KB Created: 2021-07-28 06:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82103c3e6adea44bd3e5d1445040ed3e SHA-1: 34a6950237e2d462a761f3fea5ab4e5fd48d60bf SHA-256: 4c8bc87d1dc31bc1568194ed995f54a0ee293b9f1cd39791f4501aca914fa89c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm hosted on compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the nature of the link farm suggests it is designed to lead users to malicious content, likely involving a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7573417f---24472596791.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/c2e6227add67e89ad0395b8d251e89b8/65268609485.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160db8bfbe2937---kojuxivarevibuwegeziw.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image//files/36939209557.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a50ae6c4c7---xaromugubopijex.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/53353742063.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0108642bf4---dazijegu.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/livojebubaku.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/85192369139.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/narisemowevowubes.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087d585a5ebe---javadigoxateni.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/40515146139.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/ccfd950ec64441b2ac8eed4223c4e13a/32540580484.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/68783165428.pdfIn PDF document text
    • http://odmooregolf.com/clients/e/e7/e7046aca88cfcc92de0be8f3f6b3de3d/File/50262611689.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/1e5f86690fb3aaa06232c1aa5791a7a8/pumuburozokekiduwozotul.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/87100999018.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/giwuzig.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/29342895484.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/rojex.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/19528121484.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/dofadavekomuletawapopazok.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/8oa0codgf89jhbh11mkasm16u4/nodorabixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+check+a+gun+serial+numberPDF 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_off0000ea5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5C 11088 bytes
SHA-256: 4d7fb2f8f938afcfcecad2885a0da3ccff5b0897d1dce7e07e6975aef00656aa
font_01_sfnt_off0001040e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C20 16860 bytes
SHA-256: 8254802ff3a37f1fed0bc78caf610bead3dc407eef60e6c88011907e353bc9a6

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