Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ebb0394f829868…

MALICIOUS

PDF

80.7 KB Created: 2021-08-19 13:42:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8d35b3e88c5d680168dd657b4643377 SHA-1: af9abfa35e199c135f935b63aa03b822de580e8f SHA-256: b8ebb0394f8298685df6967d6971346fe615211cd972a4e87cf896b3c20d3e9e
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. These links likely serve as lures for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9092

Heuristics 5

  • 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
  • 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://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/a5hss7hokekk45a7m7hbqoen82/nunafire.pdf In PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/morum.pdfIn PDF document text
    • https://fratellifurloni.it/file/15258674830.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/xinifumubexif.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/78235515086.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/acf0d706c73a1bb617ee07bb95eaacc1/65296446711.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160909473c1497---lulewazev.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a2b0810ca9338b225c93eda5794000c6/xaxegodivowul.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/38592074725.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802f9d40f4---gibapimifituf.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/5051475765.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d6fe345a5e34e24ff99741a7d05aacf5/gotezelikanorijuxoxalo.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/88251122137.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14f17c7e9---25441623615.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fea8cf91f28---moraxov.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/95045128771.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/89126764650.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/adaed4c5c567b1816a1cb6317d54dbac/vuvenorevuzawuti.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160767af758683---walewosebaxaba.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16085102f05417---56580768347.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/nativuza.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/51380505315.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5637b22ae4---mejebopuf.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/ld6446q02bt24t5cgsjlqmcfih/21651782612.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/91301801190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=niveles+de+lectoescritura+margarita+gomez+palacio+pdfPDF link annotation
    • 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_off0000e764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 17052 bytes
SHA-256: 0e931118dca013f288908a2826ecc156bfed7359040c56e0f9bef24bd352ac8e
font_01_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 11064 bytes
SHA-256: 69a293993bd1dc558c15073505ddf9fafda6fb3a30fec724bb8a0488c08e0499