Malicious PDF — malware analysis report

Static analysis result for SHA-256 521fe6d4efe8ccd8…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 12:36:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b6c0e9f54583a015ff55b93fffc21ee SHA-1: 1f66b185f29fc551b3e3efbb82985b9bec989510 SHA-256: 521fe6d4efe8ccd862248b06211af27d0266a5160d9a2adcf46710c60af9f66f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an intent to redirect users to phishing or malware-hosting sites. The presence of external URIs and link farm characteristics strongly indicates a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=twilight+first+movie+release+date
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5256091c9---sorumogosaxidasosowow.pdf
    • http://analogsys.com/uploaded/file/33904185860d3b930f1b57.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090176bdee96---latulegaj.pdf
    • http://murasakijr.com/uploads/files/56428424364.pdf
    • http://beiwendq.com//data/attachment/file/36238188438.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/241bfc2a492979e6d3288a9199869a0a/xisawulixizalof.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82b1331d8b---lesivitenifafofewa.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/fe9250d8d8f1a3fc48a3bfffca7a44e7/fimaxafefefuremuxilidi.pdf
    • https://asiajitutop.com/contents//files/7102740483.pdf
    • https://muratay.nl/userfiles/file/24615287656.pdf
    • http://asfalon.com/__files/file/jibukumozabejewemu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1524f3135c---nujasajusugatixegetovet.pdf
    • http://irinka.org/ckfinder/userfiles/files/70592062284.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962743bda4a---nagedoruxibifupobinuriza.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2b62b7171---jonenubab.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/wilowegunesalivojifepuz.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/1a65312ff2bf4c8a61d2e6d2af4e911e/5214398472.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/6bde3a5ae44122f0d815c4bc16f45994/rozeletobolo.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/n1vqt8cdao1iojrffate66h3a2/demexerubepuzajegawakike.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16070619417b67---bovajumulakokefodanijal.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608f675d5fbfe---wutaruwopuf.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780f5871541---41696264932.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010714.bin
7ad7fd066a7b78a8e4da6f996d568806c53fee86f83d7d7425a00b83d17ee94e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10714 18768 bytes
font_01_sfnt_off000138c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138C7 16792 bytes
font_02_sfnt_off000150de.bin
b861369f6c1903e5df6298528399a2cd6f3a8f504ba250391fcce3d6e7d85736
pdf-font-stream PDF embedded font (sfnt) at offset 0x150DE 10812 bytes