Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5425e8023e3ee5a…

MALICIOUS

PDF

104.4 KB Created: 2021-09-02 13:22:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00a155a6e1b063ae54b2570554d40397 SHA-1: c01ecf355add20ef22ed0289729b23ad843a90e4 SHA-256: d5425e8023e3ee5ae2924dee5e64d795c62b4806c436f2bacc5eb33d3e1bc92c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chrmglobal.com/userfiles/file/muvugaxoxotulupubumubumo.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e5d2b1bbbd590c8d935e9e4e19d06630/vodesazos.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099ccbbd784e---17584887353.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/44a3ccf4fa45e6d3745759edb7e21e44/jepizuniforuteda.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/gizuzelajirar.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/19830787218.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/60217429489.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/4rfpg2v6rbm09utr84dceme6fd/vibexetegibusojurunibev.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611fbe600a506---jafibaxerakujowaro.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/mosevalu.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/13463477509.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/61706134756.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/viwizafapijomazido.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/vevaragizasas.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/a32ee71e5634408ef03faf0bb9d64fba/xelubutifajax.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3ff1b0e45---zanesedositatufepapo.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160842191d78c6---35025207205.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/b356eb25c65fe3e5445fcecb0291a822/joresegowitarutoluxufile.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/lutujuja.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/8p8aet467ihmqbooj0ctj39r26/kegul.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/vawemofidimovup.pdfIn PDF document text
    • https://mmszke.hu/files/file/83111865869.pdfIn PDF document text
    • http://yepuco.com/uploads/files/zemerewewuzuvapin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=perjanjian+arbitrase+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_off00013201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13201 19024 bytes
SHA-256: 59782966360393f1b5d19ee2fa5e0a944d7e630ea73b791e94b41d453debf68a
font_01_sfnt_off000163ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163BA 10596 bytes
SHA-256: de562ba2860e610b87a3a12ff51487099395103116f58ba6669c6d133c4c078c
font_02_sfnt_off00017bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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