Malicious PDF — malware analysis report

Static analysis result for SHA-256 364573155c475678…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 18:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3057a743a35243bca55931e7b11dc191 SHA-1: 3c8e40b3f50057fb6ea68c222a699b3108566ff9 SHA-256: 364573155c475678cea773ecaea4fc10b68b0a66be52561a0256b80b9ab8d98f
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The heuristic firings indicate it functions as a link farm, likely intended to redirect users to malicious sites for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://archism.ru/uplcv?utm_term=tcn+neural+network PDF link annotation
    • https://hsse.hssanesteban.cl/files/86960335297.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/zonebeful.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16142a52240ff9---58404076099.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/38638542517.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/javemimerekadapozatopu.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/13523219677.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/30579060692.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/44193837030.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161414ca9d1aa3---45597235062.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/zugukigavoguvizum.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/12945419099.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/30025428948.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/gigus.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/wakoxunigabimemewesitir.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e0dc625826eebd068ab42783c83a7f1b/8818248870.pdfIn PDF document text
    • https://goodline.by/userfiles/file/851335416.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091422237_1007007433.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/13720435631.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/duxefaxiv.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/85528837732.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/76791656968.pdfIn PDF document text
    • http://aesg2edcv.handylover.com/upload/files/zuroseregobok.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134f09123b3c---bojibefixirixazalumulova.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_off0000b122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB122 10204 bytes
SHA-256: 516912b6fae7ce0a436349c44e3103f54740c40fb9b34e6e9f7da79ae0ac305f
font_01_sfnt_off0000c83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83F 15888 bytes
SHA-256: dabfba75e6032ab065546775c1f24b1524ec9f89476228de1b7a67e3b7402757
font_02_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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