Malicious PDF — malware analysis report

Static analysis result for SHA-256 e740663a647beb66…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 04:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 286eeaf1d1232bd27ef413c8405e6fc5 SHA-1: 3b5de3f33a4d51c0b4bfcd5a89000cda1f1f2b08 SHA-256: e740663a647beb66c1fd9df54ff841406999b41ee262103b577a43fd9105e29b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • 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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071519503252---xeweriwatozisaluge.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b84830ad126---409773291.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/dokozepamowikulibajawelow.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/befevesefigimoburamipe.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/97242736781.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/zivafilizenizigifag.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/98838994829.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607406afe8692---19876679811.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/55893373799.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/sipigitagoposafivu.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f016b79dcd---vanavoxekezava.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/tanukune.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5971d95e24---63080058303.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071840a1b657---41697786762.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a227a786---49758703734.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be4dfcbc54---2433077776.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/v5ihbpavke7sulpav03838ehhj/zilumanexamadomamoxeje.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/nexujovitiziweb.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/pubopezofululajorufomoxij.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a2a8b17e7---domawuzona.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/suwufadudibinewetimokatoz.pdfIn PDF document text
    • https://sapporopools.com/contents/files/nibumovolitagopopud.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/djcdpvflpqpg06s103hcdrabm7/vegexigu.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/mutaputuradikogopifem.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/kawonetowolekeralojo.pdfIn PDF document text
    • http://debeleven.net/UserFiles/File/vusedufamomuda.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/62906651215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=convertir+pdf+a+word+para+modificar+texto+online+gratisPDF 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_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF316 17080 bytes
SHA-256: c4fcc4c6df53f1b5f6e16649c527e8d3e1229862bb7a07be3600c7e09e4e5c85
font_02_sfnt_off00011fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 11248 bytes
SHA-256: 647325239bd5f4a0f4706caacb61650965e5795e119c63578cfcf83d688f3967

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