Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37a4d13bf164902…

MALICIOUS

PDF

79.2 KB Created: 2021-07-03 15:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99c0238a9a3f2b3ae94ebb2a5c6e0772 SHA-1: c0d8f0093313536b45c0ead0385bc09a7b953140 SHA-256: c37a4d13bf164902a82d2ce0664165efe41988148604814d466ef56b3359295f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/7f71cb66e44edb2198a996daba51f337/68455639987.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/9uv823v1uv056solkvnolhi34a/tawudajazukevu.pdf
    • http://www.bufolari.com/public/immagini/file/50404583547.pdf
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/robobatipuvasaroxezuwo.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/233a7add0d3efc257fdb768a30f90d31/43560450915.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/d86a7b9ccf28b9166fcff89a32b708ce/27962405578.pdf
    • http://consulcongress.it/uploads/assets/file/65546315334.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9804fe6f929fac0e901e24a277cfecbc/96524775504.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e1d47066d194c87e4b73874644f2d604/23154104456.pdf
    • http://enricobarraco.com/files/73952303527.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/953ef7bbaf384ef4b04336bc71406da0/96636752295.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cba57f216ca---30094048480.pdf
    • https://pellevah.com/upload/files/50431728343.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/kojuxigopexunaruv.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077118588b11---razorajon.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ba45c477039e05cb549071d78bfb4446/85381547318.pdf
    • http://patp1ryb.ru/media/file/94034069494.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8maq06ittmae7i528cbratjk32/fidufazavirokidotisoduje.pdf
    • https://skvely-kup.cz/files/file/67929069342.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7815089fe6---4374666470.pdf
    • http://amuseonline.com/absite/userfiles/file/6660510074.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bea5c74d6---37551632979.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=all+types+of+lines
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f50d85326fe4c18c42f4b204812f0cb2/9086015484.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_off0000d419.bin
b9c6b535af7654e798dd74564b3e5bccdc3050a4abb627e0917052070a3ec93b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD419 10184 bytes
font_01_sfnt_off0000eb0f.bin
b074cd8fc858509018c40b8c8acd48bf35442fe222ee3ccfab3bb7a86fb288bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0F 17200 bytes
font_02_sfnt_off00011792.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 16792 bytes