Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ef0a30936f4140…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 08:36:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0af4db4ecc12dc4a811d0e51c89f5eb1 SHA-1: c81cf2733d406b21a9104216e72f7fa54b9e1221 SHA-256: 63ef0a30936f4140252abbf4d5e68fff6ec23ecf22167548bd93aa66cacfd27c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ninda.vn/userfiles/files/baxuzutozikomulovu.pdf In PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8180487947.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/zilozoto.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/e7q7i576nuounrgi8cibhe6s33/65408112993.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/85331966626.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/37845968076.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/varujujobe.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8738135006.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e1f1033d5---63458649839.pdfIn PDF document text
    • http://normel.org/files/upload/file/55920481182.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210912_F6F4023B3055725C.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/96953437579.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/12812596739.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/dunawigipukilupujisud.pdfIn PDF document text
    • http://simoncaulkin.com/images/mevuba.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/75555398083.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/97225410720.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/36843421229.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/josodofenepowel.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/036ljkeqbe63ena1q0n7ga7gj9/39319990444.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/70919359018.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/nopiba.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb7bfc3e3d---bomozemerajiwadanuwige.pdfIn PDF document text
    • https://unosms.us/userfiles/file/xiwobuziwuxifazux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+v+download+android+obb+file+and+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_off0000bebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBD 16372 bytes
SHA-256: 72e995fae19392910f1fb46a3ee9432c578e8d19781c5e66561f81b69d7afa35
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 10748 bytes
SHA-256: 071099af142e10425f4648f4abf09614d554a11f92a5b9997c18bda0d8414307
font_02_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1