Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f9316a6af8aa1c…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 22:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c9c7e7e9818950a61470711d04543d3 SHA-1: f443685cfe9370ca02b4811955243040ecc004f7 SHA-256: 57f9316a6af8aa1c9b54d2caf21e8584ac689234938c853c94a93e95f78f1e6f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be luring users to download content or visit malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=kgf+tamil+movie+1080p+download+tamilrockers+hd PDF link annotation
    • http://garankuccu.com/upload/fckimagesfile/8d548ff211eb39e4759142475a3b3e9c.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132fabe270ad---94863230867.pdfIn PDF document text
    • http://kunbot.com/upload/files/28547188956.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/noguwosexuzewarebajawumam.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/damezadoladigemuwiw.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/pubuwavi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9bc7ab4f---ropodonavekuboxikobafemi.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315c0c1b5d2---vakorifejofejurafinabanot.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/66259490804.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/wawetijelinufa.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/92151736700.pdfIn PDF document text
    • http://ombs.ru/uploads/files/samupawasibezatako.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161425cc30ee1d---17399100300.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/zikisabisakitodixedip.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/89887607951.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136eee977f04---10014486007.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/86318046727.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/24821291878.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/9b663ec72ac6ee50355f839105ae21e8/parukes.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/xojizupulixi.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/15110840541.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vopamibakedijajazen.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/davulutorabujitax.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_off0000be46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE46 19116 bytes
SHA-256: 74199a0d32472f6289528ba3c0f3e4fb18608d027160dc39c8d37921b4e5fc02
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 11684 bytes
SHA-256: 59b386d746ea14c8ec1c8500e31cb95ad7c6d0e784f24a8e6e7579480172feaf

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