Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee93d443f4432b89…

MALICIOUS

PDF

78.2 KB Created: 2021-09-18 01:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c532e090db077e3addd4e8c045f7f924 SHA-1: 87fcb35859d34f5912be016d12de61f3b24b9b4f SHA-256: ee93d443f4432b8963fcff0423690347da8b5788844e506fdef878251380fabc
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malicious content or engage in phishing. The presence of a 'download button' heuristic further supports this malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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.
  • 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 https://crewmak.ru/uplcv?utm_term=gta+5+visa+5+download+for+android PDF link annotation
    • http://hkacca.com/userfiles/lefefoniwekajapevonobe.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/24971171161.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0a7ebeffce3cb853e2c35df338a55eea/21536132164.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/vobizekekefeguruwugedip.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/13687309445.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/20744135087.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9ee234ae---febogofowofikuli.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/farafiwaxeruguvakevonom.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jagejuro.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/renegepo.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/zilezazos.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/vufikovewub.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/34646805418.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/8522980426.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/jojosoneru.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jikixovet.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/95578867255.pdfIn PDF document text
    • http://teknis.it/userfiles/files/6965539225.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7db6c54998676354828046a58d1f95ee/69058667574.pdfIn PDF document text
    • http://kco.su/userfiles/file/vawekevetipawefot.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7dfe0f639---49374058566.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/11722092508.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/65720678787.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/jupopewapajudowaxe.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/fedimexeke.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/35058235312.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/tapal.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_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 17576 bytes
SHA-256: e678d46e38be91ab73dcfdca4aa6a6c94683653ed5943e23d0a51b1cffd47a05
font_01_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 10540 bytes
SHA-256: 9ad3a9ce8c5d02346d4b8834f7bfb0313a6f2406c3978198714e13fb450a5d20
font_02_sfnt_off0001115f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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