Malicious PDF — malware analysis report

Static analysis result for SHA-256 e603ebed9da6b45a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 23:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 547c965b721dad8b11091e3466699e1c SHA-1: 3fc9443172991f84fd7e8ac37cc44e833326ee05 SHA-256: e603ebed9da6b45a4d927acaa2d30bef72f3466306d3b23e18bf36209fa1f722
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML models and ClamAV, exhibiting characteristics of a remote-support tool lure. It contains numerous links, many pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure and embedded URLs indicate a phishing or social engineering attack aimed at tricking users into installing potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://philabc.ru/uplcv?utm_term=use+phone+as+drawing+pad+for+pc PDF link annotation
    • http://kidzcastleschool.com/singhania/downloads/file/bakamurivepuletoni.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/35245543548.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021932234145404.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/kemoravikixakiwemovov.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/lasikizikito.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/84291036928.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/52686620918.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e69c171fd---mufopugig.pdfIn PDF document text
    • http://vit-physio.de/file/jejorifegujop.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/34523300598.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/25712907402.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/wetoruwiwevep.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9e940e4d5---23812992585.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/kufujasetabimufinevurusow.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/gudabu.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/zoligomatafupoguponunug.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/73728460497.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/bupemasugenerufafifaf.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/64781780031.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/lidisunobo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332d5aec0e4---dikovexulibusofer.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/mefaxowodafubitizofej.pdfIn PDF document text
    • https://lapdonline.org/file/fopefunuriw.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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13C 18192 bytes
SHA-256: 439ca0870fde9dca88b6cec2a40206eacb9017b8d0fbc64fc54ebb1019cc2ed1
font_02_sfnt_off0001206c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206C 10848 bytes
SHA-256: 444e07ccfde652a83d09d81e655a290e5866a6d410165f55b9f5b88639f7785d

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