Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ef2374a25fe6db…

MALICIOUS

PDF

96.2 KB Created: 2021-08-14 01:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 420bf6e379d0c473788ae5fb5e518cdb SHA-1: d9a921de92ebde1023cd56f67b96e07a3e1f04a6 SHA-256: 90ef2374a25fe6db63c3bb6aa42705b5741f29d142ba1895ceff828b4a1524ab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, suggesting the document's purpose is to redirect users to potentially malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://getracemirates.com/userfiles/files/26519636243.pdf In PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/dagiwezopevasatakabisa.pdfIn PDF document text
    • http://abworder.com/uploads/files/dekejumolo.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/54048470015.pdfIn PDF document text
    • https://ewt.cz/res/file/sasow.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/rejevijewomuvitawekuzit.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/1a697118ebfbf04eec1f7a6db2465926/podanarurubatiw.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/596c4473d1d4ed5f417140649737306f/goxewibezel.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/124377919960f0da342944d.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5l1fgk1vmo72cqo14cd9duvefc/32366979925.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/bijudis.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/0b1vid3vam5f75ksc8hsbina0m/gosinotamibiso.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/jgbn30i12pdjvt6tg5j1ig4os5/52313464768.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4cd3b4255---41701434820.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/22575755637.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///1870034046.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/13449113209.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/tirapagirofu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4feaaae67---96770460098.pdfPDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7bf3662f---fisagap.pdfIn PDF document text
    • https://ccskin.com/geektic/files/ziboxototupetogagowobidi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f86ba4387---5766550064.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/ae420dee74a820246be0db2d1e99f753/femepisuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=other+words+instead+of+master+of+ceremoniesPDF 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_off00010ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF0 10804 bytes
SHA-256: 91f994d984deec4a6809e854bbd699db1a4562a9f44c1771af5132686df07403
font_01_sfnt_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE0 18992 bytes
SHA-256: 72b3171928d980e4859b466244cbe9fbaa6fd10e8a3fc210625a04061f41740c