Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6cc852549daf30…

MALICIOUS

PDF

79.7 KB Created: 2021-06-25 12:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: b6d088eff136ab47143f683189e5ec49 SHA-1: 1f3869c80c082999c9dc6875b5b54807b66b61e4 SHA-256: dc6cc852549daf301dd88f7361298ad1d377c014407d6c6c9dd384518b5bb690
156 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users. Heuristics indicate these links are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=pdf+with+track+changes PDF link annotation
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fe8760044efcf81d10d7baf8ffdc85e6/zagamogelavodajen.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbb8c24d83---96142146540.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e398d401b0---70592702872.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7713a989ea---linipadenomakovebakab.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160995102eb01f---vurexiwizevutujoguziso.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/gt8d93fuq0qbsr1ak0t6rujt8k/wukodovadijokam.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/pevuxomomovarepinebe.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f8bcc01da559aaf0002fce6f52966ce3/30228286575.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9eee6cc381---zenipifa.pdfIn PDF document text
    • https://dm288.rs/slicice/file/96277554531.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/werepumabaxejojuzafosoxo.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210608_071242.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/r7soa64pcab7ciljiop8spktmb/janibozeterutejikulalire.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/843aabfbf39aeaaa36c628d700d78ddd/mevez.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833ce64ead---86375222736.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/63167035348.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b20ea5f23d2---49264139327.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_off0000d462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 10768 bytes
SHA-256: 646b2c6ae77e3b4f317b6c1cbc09621fae62846bf264c20cc9a3743b27f33fc2
font_02_sfnt_off00010515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10515 16800 bytes
SHA-256: ac8624d8436c98176320bedb1de3e911b0abd780ad17c6478b0a48ff657ff623