Malicious PDF — malware analysis report

Static analysis result for SHA-256 b290b8755190c0ed…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 04:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86a869e51f1cc134b4d214ae058df2c0 SHA-1: 3b6ae35bb9591c9d0fda5bc134fdb4b42498da4d SHA-256: b290b8755190c0ed56de6774b710de002b47e8b3c3279fdc62c8163d845d69d9
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, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, likely intended to redirect users to phishing or malware distribution sites. The presence of multiple compromised or disposable domains suggests a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111070392c60---9043383271.pdf In PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/47633291191.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9sie3c6p7m49dvel05472jc67u/xawupolojomi.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/639c6e2d278ad3031bc0e2647a7232a7.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/10c98c8434eb7aa1c81f21286f74bef8/zujuxus.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/peviliroguwosutif.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/tavobuzila.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/25404774645.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ugma4p9ngd50ltit8m15f0mn78/firimazadoluginawojaso.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/82898981280.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/tidudiresobunuroradom.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/fovulurogupevejapeti.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730e439c470---fafilubetuki.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/4368748322.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/luvivezakesi.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/sizujo.pdfIn PDF document text
    • http://minhanh.com/files/remubigukekolixarelijir.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/noxawevaninibupofi.pdfIn PDF document text
    • http://3q1p.com/upload/file/210706232143617126mp6h9tz83vmv.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa1af5f04d---92979891134.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/mukizewuxemebolo.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607226f3f0862---lulovixaxu.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/v4gutnnfe4l5s9juacahimdfof/30230752421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=etabs+manual+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 10440 bytes
SHA-256: b93a2a351f5241152aa209544897709430d42684b0e23bb3a3ab8ff76b4436c0
font_01_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0B 18860 bytes
SHA-256: 20bda5887436acf6cf9661fb2d91c53ab264691a7fafe7380fd553d7313cbf30