Malicious PDF — malware analysis report

Static analysis result for SHA-256 604793a694d918eb…

MALICIOUS

PDF

99.5 KB Created: 2021-07-05 03:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe49f1732b0c98705aec62dc0bda0cb3 SHA-1: 5f0f3e52bd9861df3c46714e0061c737cf6e6826 SHA-256: 604793a694d918eb232a05966da80c1dda3d05ddc70e0e37f7538105fb9597a2
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://coretry.ru/uplcv?utm_term=how+to+play+scooby+doo+betrayal+at+mystery+mansion
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af999717a2a---39437514075.pdf
    • http://artecgroupservices.com/imagenes/file/8140945735.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/aecf2ed01768bbebd372c985b08f14b0/wubaridevukofurosewedeso.pdf
    • http://thessalonikiflights.com/files/files/41063217096.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/733f94e99fd4736242a09f3dfc713893/44469152840.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/20d2335553fab429b714ff0a7b510def/duduzodepeta.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/978dfc3a1327b164fffbab746e6fd1f3/57739337875.pdf
    • http://controlsystemco.com/cache/fck_files/file/23013813151.pdf
    • http://kingcraftviet.com/uploads/ckfinder/files/vatukox.pdf
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/bisanokatos.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-9/20210509123043274118.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/srokkdphrkenst7grc48c4pjen/fekarisajogesapalerin.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a279ed2ce8e---62897817328.pdf
    • http://polymer-optix.de/userfiles/file/42521292164.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072041fcf4b0---9299505496.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/haqkb0ilb5fhukgu0gjsks2oq3/98114300796.pdf
    • https://lemanssrl.it/file/14802869540.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/lsg55lbeh3lqsupd65v66tkpn5/16836694413.pdf
    • https://michelbarbot.com/upload/files/20051806594.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160844d0cd6eaf---7531354956.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16071ea47cab7f---kikujukigapumo.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/mutivegig.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/fdssr4f5da89qurg5hrjlraj1s/50622802968.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117A5 16792 bytes
font_01_sfnt_off00012fbc.bin
ce949b9ef424cb1ae5a20b62bf1a29e19f3e0fd427343b748739f888d0d89bda
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 11004 bytes
font_02_sfnt_off0001491e.bin
9019ef761c85e004f9db97205f19d71ecceb20aec08b1b06a5db0bb7bd8a89a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1491E 17124 bytes
font_03_sfnt_off0001757d.bin
5867a30a0d6824e62cbdc397982932b9d7d9b8b3ede169a30f3fdcf3d567ee5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1757D 2404 bytes