Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12f76fac0674e16…

MALICIOUS

PDF

77.0 KB Created: 2021-09-09 23:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f3b9d3875d06f7d10f0dc7b2d1ae6a96 SHA-1: db34ac871da36ac89c0345e232aa6d04d3df23f7 SHA-256: f12f76fac0674e167ca8dae74af94c8918d3ec49e0e070b27bf469a2ddd7e729
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.ondebiz.com/userfiles/file/1233942276.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/940abc5dc093aed965e8ed0c3660b9f5/62684043104.pdfIn PDF document text
    • http://thegioioto.store/upload/files/sewemanakukaxodurufi.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/73700782554.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/bisotomilozajonizu.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dunokabufe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134c06665536---nomelesozejezirikunaril.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/2755278633.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/92611717263.pdfIn PDF document text
    • https://12shio3.com/contents/files/lupibakamogiwitulisojase.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fa5e49959b69b6c617fa5b5520291f63/6825032647.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/zetifereguxapofojopobuzad.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021090218531520.pdfIn PDF document text
    • http://melabo.com/upload/files/duvizik.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/rafazeveguwisokifo.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/776095592.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/dekedexidanudajisus.pdfIn PDF document text
    • http://upakuika.com/img/file/xunibazamovozi.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/fiwaximof.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219465551343.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/2798626849.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=joker+888+apkPDF 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_off0000c14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14E 21728 bytes
SHA-256: beafbff4144dff6306874d4bf02965c2c08853ab2c8d164bdc5c9fcbe544bc43
font_01_sfnt_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 10028 bytes
SHA-256: 4b96d905b496bb94d724c08bab57ac99c3d89cb15399a09c8732898634f2b682
font_02_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1