Malicious PDF — malware analysis report

Static analysis result for SHA-256 51ec082aae5338d6…

MALICIOUS

PDF

79.9 KB Created: 2021-09-12 16:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bba21021afd4ee0d8283e73264f6bfaf SHA-1: 176a7e6e38b840b41925b7df2454b5da1e6a86cd SHA-256: 51ec082aae5338d674f957a4986296f100462bd37b9d3e9e49fcc6d011bbff3b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, including one that explicitly mentions 'free windows 10 download iso crack'. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=free+windows+10+download+iso+64+bit+with+crack+full+version PDF link annotation
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613042747623d---35578494840.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/sosafoxivelof.pdfIn PDF document text
    • http://gerocuki.hu/user/file/soratanate.pdfIn PDF document text
    • http://pileki.com/imgup/file/javelidaka.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/88559903670.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/dogaviwosiwemov.pdfIn PDF document text
    • http://greenld.com/userfiles/35977502653.pdfIn PDF document text
    • http://plncse.hu/php_data/file/rifena.pdfIn PDF document text
    • https://bem-sa.com/img/file/nexugojutepis.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/40190984.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/vedun.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330d9f9502a---94200377913.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/gevilixuwufeperuvobajuk.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210907185135.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/844511904741631337350.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/5834838778.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/97840437015.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/23339055745.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/panaju.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/41925304305.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/tajojavus.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed0b7d008f---21635043837.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/nukaparizabofebeteve.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210903/16306254718901.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_off0000d114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD114 17468 bytes
SHA-256: 770d8412a964ea7612e1b996697b47d575ec500e65f32ea3b0e257b5c4dff727
font_01_sfnt_off0000fece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E5 11452 bytes
SHA-256: 81f2784485cdc95f89ba3c8bafad2192f47a5d95a50da6530abb7c7c5bc55fa8

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