Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1a6aff27201a62…

MALICIOUS

PDF

80.8 KB Created: 2021-10-21 15:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1fd14565b09178f411cd2b4f024699b4 SHA-1: d046736458dfecf945dc1d08f05cd10137e492de SHA-256: 7c1a6aff27201a62c359cf623f5006e2da7a583ac40ab52641cb18bf25bebafd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it functions as a link farm to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=tooth+decay+yellow PDF link annotation
    • https://equalland.com/uploads/File/61745014868.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/badetazegitubebuju.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/3208011503.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/viwodutezana.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/tevelijiwomonezokupe.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///mezamidawuv.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20211005163038.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/wiluwufusafelanage.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/93121794592.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/dagetizidexizam.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/mipesolunavuri.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613c849c3242c---94485424423.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210926070156.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/93586628577.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326a9bd288b---52948959913.pdfIn PDF document text
    • http://stisk.com/file/86861273285.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/44879325708.pdfIn PDF document text
    • http://besteva.com/upload/files/fizivonusaseto.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e20fe93e3506ab3154677895cb8c2f10/kotutamowukabenegosa.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20430cc04---79740948351.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/nojikefu.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/69129489433.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/nufewasalajosadisikozex.pdfIn PDF document text
    • 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_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 18360 bytes
SHA-256: d0ffbe3213234fb4f0a938b9a1475957be6ef586058264a03fed36831b05f5ca
font_01_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 10164 bytes
SHA-256: fe7162769dfb183dc0d4a57fd352c099db3f692041e5ec3802b61d8d993396f3
font_02_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1