Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1171c8abc871877…

MALICIOUS

PDF

86.5 KB Created: 2021-07-13 18:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 696ebbb22280875718880f924e155ef7 SHA-1: d524eab786a0dede935e24166a5617dd918ba9df SHA-256: e1171c8abc871877d7ba995484253e45f1ce7c58ce6f616fd309a8f92befff65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are used to redirect users to potentially harmful sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/tf838ttpmt4el1b22eu7j9t745/68592027939.pdf In PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/85643456513.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/30172322660.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fc59a03a1---50238123795.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/wupotedamanogogavofulew.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ra4frp27ehtp53d3qt8s1optq3/50420924219.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/23553976525.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15fecee75---pufudavuvoxekulu.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/seu3q3731nfc8eqgh7vke6s06l/69979564871.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9lup570ep55b1joa8gksmapot2/80298239920.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/650tolde7ubgle9in6fnd7ujko/94234456229.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/xejexotigofakun.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/vumidefoxegupexe.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a63dab44945ff1ace426ad59f0bf80c4/96899392274.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/spqmd222o2gobv5r8r2qmuvq50/22007052011.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/givuxikev.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c226d7a372bc60cd6e64d51e442807ef/53895837579.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/83f72b78fd6c03da90773d1ec376a23a/30657502455.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/solipajoroz.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/wekurosimunijomis.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/78e256c33e0049f5d7f4a6abe7fbf4ad/jimedit.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/tenufalijebaw.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb2f3d6f40---12997581805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=garden+cress+in+tagalogPDF 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_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A7 17228 bytes
SHA-256: d650f6c95f6b50563928c423d630efd24cc8a2b9aced0e72b8fed58e53f9bc33
font_02_sfnt_off000134d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D2 10584 bytes
SHA-256: 7183df16c1d1690b64d912053d4354c7321a7bba7f7ef60cd05669535811b39b