Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf0ab9a7b797c20…

MALICIOUS

PDF

74.3 KB Created: 2021-06-27 00:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3e99d4abd087e4d412f2dcadbf1efbdf SHA-1: bd79aaab3337807c5dd36611d7a54a7cea857828 SHA-256: ecf0ab9a7b797c203bfcd68b27f317f7d29121eb38f7c9883d3fcbb238da30c5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt at SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1nbldbsbr8qjqron8ukmnm4kcs/tikafiwuzewaxodi.pdf In PDF document text
    • https://poolpoint.be/uploads/file/50436307345.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/79042303294.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/52184063654.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/16c9ca237661cbc036c4404be1e951e9/sakixewegaxon.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f755cbe86---xopukiropewibojadewisukaj.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/v66dbudll93j2i1d2khac46pk0/17897237767.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160909969f257f---sumenawuresir.pdfIn PDF document text
    • https://artbynela.com/uploads/file/rofetalud.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce68e0ccbd---58894873088.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b074e03d120af97a258a78b6aa3e6b3/63863748974.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/kekonudofavatederoduzipux.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/17255915336.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/67530758965.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d437c9800---25420213572.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/09bd604e396660944396bdcb6b34d1ed/sixadafodotum.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd4021bd16---53179232610.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/blllicnng0iav8v6hjrnqkcqdk/23368537712.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/ketafaworubofekodamida.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/matanipilanusunuraguvab.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/10142437993.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/52d78910496c8e49fe8ad93ddb585c5f/sitevakiviwazag.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7d2c86a8ebe8955fae4f2908a4853b66/49977056942.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=op+gauba+an+introduction+to+political+theory+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_off0000bf39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF39 16484 bytes
SHA-256: b2940ea28618b51dbb76c08120ef69cfe62d4d3d524dc8e7a52c65ca91567389
font_01_sfnt_off0000ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3E 11112 bytes
SHA-256: 74dbe9773e6eb011e6f90c0675af8363aaf0060c028e32c6e4b95ed90002386c
font_02_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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