Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef40019f9108ceab…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 15:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e98e8e57254e22092327b666cd185d20 SHA-1: f913fa6f67fcd25f5bf550304859eff574ffe7d8 SHA-256: ef40019f9108ceabdb8262f5616868df4b1c8466aefdae1d6d0fa453b25bed3b
176 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Multiple heuristics indicate the PDF contains links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs are designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a5a3067ebbb0a9392cb412908cb05d1a/80885722767.pdf In PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///nenekuwarojejokuwekoni.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/bilapenobimimujalog.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893df7576ea---40216664881.pdfIn PDF document text
    • http://medica-brno.com/files/wavujep.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073e83a25527---keninomofijipamadorugi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608295715aa4d---90391930974.pdfPDF link annotation
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/fc8d7f4bf5912fea2fb5274cc8ec787f/runojelevapupov.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cd1c96fa0b104d0a9a0af915eaca6faf/dimelajixofop.pdfIn PDF document text
    • https://kawanmto.info/contents//files/39966685968.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a92852c565c---44110907115.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/rakoligilobubub.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/xizuvevibogafeje.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/334facac6e9d4f4a7da211204d4762b9/81179201950.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/tisifuwunusu.pdfIn PDF document text
    • http://kwartetproforma.com/userfiles/file/sefofa.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/n62i5di2v80c8rkaufo1523j90/8444870678.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/33048069929.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/jadejanuzafizezilefo.pdfIn PDF document text
    • https://loctra.net/userfiles/file/13659569952.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/69917428300.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/bulubobuzavemofemuxi.pdfIn PDF document text
    • https://latework.cz/soubory/muvidi.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/danataforalonaxotonomeb.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/98881702966.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/3d4d43aa71544106342659efe926a4a0/jiwilubapepowipaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=sctp+in+computer+networks+pdfPDF 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_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 16900 bytes
SHA-256: c9c6c9e481369c6aa6e1863b574a4f944210f68061a71fbac0ea668d5c8c2088
font_01_sfnt_off00010af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF2 10928 bytes
SHA-256: 9903434b1f76afc7f20d3099ebb9add40b5ae85b800c56ed7b0d34627a5bc748
font_02_sfnt_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1