Malicious PDF — malware analysis report

Static analysis result for SHA-256 b485fe4110ecbba0…

MALICIOUS

PDF

96.6 KB Created: 2021-07-29 18:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9138e7bb90d725ad8ea28418cee3ce04 SHA-1: b0e73d247a2dd907bc9d13da45a148f48350e1ed SHA-256: b485fe4110ecbba0d5f42c9c27c08e914c7660f9ea478da5eb9076e3e2d2e563
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b312a3fe2e---59549506643.pdf
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/belodeguvubesufu.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/aaa300da0b8b73cfc97af2a95c6a7318/zujidokij.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9bf2d25bb90ac23e8eddf6276fe462b6/wevopupovepititewus.pdf
    • http://adria-ex.com/images/blog//file/16211497671.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6789bb391---jafezekasozinuwavib.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/9ce850d743c6e65989827846cfff5c1f/3257373708.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb1c33d8ad---wetogerazijinanamariles.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7c1e3d93fd655492648e4709c84d75e5/gagituvovagabowoteraju.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a417069e0a0---30701341793.pdf
    • http://centreforeffectivecoaching.com/media/file/jatituvejuvuxori.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608abcb9f3c29---basawe.pdf
    • http://metallpress.info/files/dejizipizajen.pdf
    • http://ceraunavoltapizzeria.it/userfiles/files/81759075799.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ca5c36970---wakirenilopibegalebez.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/lc9jl3h5j5eebama824arm7ua7/38353516010.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d232e62e71---fovavetozerosupeduwovo.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/8j6fe05hnvea9261dda0iihajl/minafapusupisukapu.pdf
    • http://al-farh-iq.com/upload/userfiles/file/kubixu.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26a238d104---30339008665.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3e79e3dc0---xenibupavad.pdf
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/dugojuwozoxebogikib.pdf
    • http://hykylalumni.org/userfiles/22516493742.pdf
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/movodadazudigiwegadev.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/8861105b9ec6d9de60fdfe062a51b691/xepegibamawife.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=el+amor+en+tiempos+de+colera+pelicula+completa+en+espa%C3%B1ol+latino+descargar
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2a.bin
97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 16192 bytes
font_01_sfnt_off000103b2.bin
4e0f5652c328fb32c5875538a56b3388d73bbb1323d70647afc3759fe0bd5474
pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 18648 bytes
font_02_sfnt_off00013262.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13262 16792 bytes
font_03_sfnt_off00014a79.bin
b22d25d42ddc536d037c9bc1b40fbafdc4fc59cf2aac961655de7bf5c4680323
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A79 11144 bytes
font_04_sfnt_off000163f5.bin
5b5011e89d777127e2cf04d1ad3dcd6e402650fd02da77e15541541614dace89
pdf-font-stream PDF embedded font (sfnt) at offset 0x163F5 2768 bytes