Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5dc0b3ea558aff…

MALICIOUS

PDF

97.5 KB Created: 2021-08-20 19:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc33d83c03de766ad3b30ff9eece5c2f SHA-1: bd10e054955d8c5a6b958b311adfa730ca5129df SHA-256: 6f5dc0b3ea558aff14bdd11a9edc62d06482fa8dbe259eacb40f03b34b295496
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=lego+marvel+superheroes+free+download+ios PDF link annotation
    • https://onlinendttraining.net/files/naverakegu.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210607_46665373B9A68AF6.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/9e005a80c2cd3a6ac76edeaef2eae4ea/25335065827.pdfIn PDF document text
    • https://luminex.pl/upload/file/lojigafakifu.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5d588f596---masogujubomu.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/49004660164.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070fdde1d654---dapetojonalizunil.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/rizasozudapik.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/8u7fcmovjs0mkp22t3kr3rvaks/95196639553.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f851ccc79b7---sidopepujetoxexodomag.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd815632316---wekudon.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8a8af6399e50d2df00a8b79c6ff884df/66726866406.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611855be84a5a---vajoradawevumagekof.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/38354249586.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160875aecaf1ec---63788996071.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/41895519889.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/bikebigakexik.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/zisanatume.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01ffd0552---tejisusegesumikimel.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/32974728109.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090ae8ae7f7f---dijinuxu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160741e11a8ace---beretexisevibasem.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7de7bdbdd---redadomavenewelet.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_off0001154f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1154F 17900 bytes
SHA-256: c29de5ee9f3a0cb16fa63d2826564a0c27a346f213e87787ddb4df9bfafb5db7
font_01_sfnt_off0001448a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448A 11056 bytes
SHA-256: 33312163f6fc83a2ecbb5c5365355c0c42d74cf9a1ca108a8f8b451218a189e0
font_02_sfnt_off00015de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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