Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b6635caf0cb5d2…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 00:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d48ce094d82499cde168e75e5089ad65 SHA-1: a9b0987c5b9f36c94e69b480ffc38478a0db9cba SHA-256: 91b6635caf0cb5d2370f04ad11266bd3dbb12d77c2b24e757877ebe227c98bdb
164 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://catamma.ru/uplcv?utm_term=cardro+pro+cracked PDF link annotation
    • https://printjet.pl/pliki_user/File/45333158485.pdfIn PDF document text
    • https://kinohorror.com/upload/file/9547769980.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/71712044446.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614747191ac91---10391334847.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/1052393472.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zogelojulu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/25832954b6f457d5fb15adb93ece736e/25244126804.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/wuginure.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/17116768198.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1613b10f544262---gonubedakopazazunerifida.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/sudemuz.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/janozanuduzodafomeg.pdfIn PDF document text
    • https://showerdrainplus.com/uploads/files/202109261350034986.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/50866337773.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/33239240399.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/rijenizemuxure.pdfIn PDF document text
    • http://vestmorecapital.com/images/epost/75615288106.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1632506923.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/metogewunolevozorikufa.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/lepazemamofesanivomodo.pdfIn PDF document text
    • http://ebus.cn/up_file/file/91851358750.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/rumulazivodeponoj.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/93633575151.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/buvugaj.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_off0000b1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1E2 10120 bytes
SHA-256: 25dd6de7fe4d3445a68742666c0e4161040807b6c805fd928a0dcd9bac21e665
font_01_sfnt_off0000c88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88E 16016 bytes
SHA-256: 413656fd2555aa7de06d777cd96e7a5df36f2ef60979dd1fb81357d4b04a0cf0
font_02_sfnt_off0000f08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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