Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21d4d11aba11cc5…

MALICIOUS

PDF

89.0 KB Created: 2021-06-29 13:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 242b61029c7c5c31c2a51d206f5e14cb SHA-1: ae23dd4f49f633ca08c13eaf780c8b84e5895dfa SHA-256: d21d4d11aba11cc545ebb399ea8b9b37dbecf184292faba2e4e63fee8de99c43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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://ketchas.ru/uplcv?utm_term=5+letter+words+that+start+with+w PDF link annotation
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6481p6976lq8hrmihvchssbe8c/90639408106.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2f99368bb687a615119ce75d6b57fe37/98488129695.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/giridakurumudulanifupifus.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/61a3c0229a8fb571a6bec1d41b6a16d7/rasuteve.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/pogokatokaseki.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/c10aa84acfc1e2bfe5ff8cf5dbeb3638/ninowumunopefararubixotip.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b083a071f0b---70301789091.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7e9e4f78c---99637096411.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/xagilovexunokowizo.pdfIn PDF document text
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/2b66fe20fb99471d9d0a3607f12bc799/34757396136.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/dabaxorejisitofulinexom.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca51bd02c---dulejixojevawisamawogu.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089750c9b6be---32623369786.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/f53ac651d51f17de37d2b63075349acd/62841535965.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/84662518943.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a73242ec0f---24722144123.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210528185321.pdfIn PDF document text
    • https://mszukam.pl/dat//file/68048582313.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b4979cf30---28620044380.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/a905d8a3a99a87f1b33b227064c10494/lokusomuletogi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7a70317f7---vufopevut.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/88edbf1e59a301ede70c0b25270cf1a6/dagodasukivenurip.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/o105j66p5ts3vs135nqu1pqb9e/kujewumokid.pdfIn PDF document text
    • 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_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 10364 bytes
SHA-256: b992b4b29e9ddf100906ac2ba127d49ea1c0921e8ba2ad2f1c12aa4e311a8067
font_01_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 17696 bytes
SHA-256: 071e5108eff509674a9c43606607b3a01a8138012f8408b09b2763139112a074
font_02_sfnt_off00013ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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