Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5ae61bfdc0ceba5…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 11:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19de769e7f8ad8fa3d93f59fe9e625c7 SHA-1: 8ff1c1bb45791f507e35cd639a18e81e1aa46dae SHA-256: f5ae61bfdc0ceba5684e45a0fd04d64abe17a6a092daabb839aff206c887b085
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The presence of JavaScript suggests an attempt to exploit browser vulnerabilities or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://szekszardportal.hu/userfiles/file/85998376807.pdf In PDF document text
    • http://pinedafoundation.org/imageuploads/file/zirutuvovisiwafufirin.pdfIn PDF document text
    • http://heichapuzi.com/uploadfile/file/46007402938.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/83841474956.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/gofetafo.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/xadif.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9b751bd04830bc55bad2c3323ce0267c/boderuwifakekup.pdfIn PDF document text
    • http://stevis.cz/files/file/xenokudotomemap.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/nijopugerenenodedobabinef.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/99786654612.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/fewolizukowomozimaded.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415bee4a0a3---20339483052.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/57653960878.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905022558.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/nuxoretigisokipowinuseror.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614197e0ad1a1---89035747419.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/lifituduruzuvil.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/1626965402.pdfIn PDF document text
    • http://beiks.info/public/file/31542080413.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/fokevosevok.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/nafimebaresafoxit.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/tipasegatemat.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/linogidosawupux.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410f704554f---dofevovasisizebib.pdfIn PDF document text
    • http://i-physiology.ru/upload/99316009499.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/29261459799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=gta+vice+city+mod+apk+download+for+androidPDF 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_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 11012 bytes
SHA-256: 2c1fe784e5190181eab165877beaf6cfbcb39046abb09347eb8334e062a6cf68
font_01_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 17392 bytes
SHA-256: 86150925734a18666ddb31cb164dd2f95bdac9c178d400a9848775b1a1fbbe04
font_02_sfnt_off0001202a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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