Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1c1e7ad5a904ed…

MALICIOUS

PDF

92.6 KB Created: 2021-08-12 05:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7363559dc090b3c139df940ca8b13cbc SHA-1: 7bfc51aee3a6dc384e2a4bae52027f9af46f4ba0 SHA-256: ba1c1e7ad5a904ed2ce8a5947487951a315bd3a3d58778558da7167d51c90d60
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs pointing to compromised CMS uploads and disposable hosting, indicating a malicious intent to host malicious files. The presence of a 'password-protected archive handoff' heuristic strongly suggests the document is a lure to trick users into downloading an encrypted payload, likely for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 9

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gwhs79.com/clients/867100/File/16323559661.pdf In PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/17040016307.pdfIn PDF document text
    • http://lcxcable.com/fckeditor/file/24584607285.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/68013565574.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/63082743356.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/b9e86ba0d0c9386e0db819ce39929705/mawogerifedise.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/lepatugirinelafu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2393467f4---61135195709.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b23c80bef1e---47195781978.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d00240b8a---dadefeb.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/334daae5feebf3b1130352f4c0407c2e/35525580918.pdfIn PDF document text
    • http://redfordunion70.com/clients/869360/File/bivumufopaniwokapivozora.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/rilogorupanadu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/75518177861.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/49539780771.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/558jg4irf24eutslucgi8cfvpj/4419779896.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93c0ce791d---78903285604.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/selopilogudugag.pdfIn PDF document text
    • http://soul-program.com/clients/e/e8/e84723a0d254fbc5507aaa4bd1967541/File/mavaxutitafowosinepapiwux.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/rojojatasi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9814edd7e---geviti.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/42868711209.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c00edb2bb58---puwisevobumata.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80c09b7764---kavorepigineta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=spider+man+3+ppsspp+zip+file+downloadPDF 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_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 17332 bytes
SHA-256: 5eb14bbf2c9edf0bda58bc23cf83f914bb5409ce7a9fecd4fb54ef3f93b5f1d1
font_01_sfnt_off000131bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D3 10956 bytes
SHA-256: 085318fd33789f8bb4d6af0911998cb5438d873f5113104dd3e5897866852798

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