Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe8573df3a16824…

MALICIOUS

PDF

85.0 KB Created: 2021-09-13 20:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 64b41fc859b92a49fc082e208c41a8c7 SHA-1: a53c554bfefc3c8b4618eacd2952608a1c04f2b6 SHA-256: 4fe8573df3a16824625434db3c218a7d9fd178767cb138af34b8a3d5a3df0fae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://diversecityuk.com/userfiles/file/54492706518.pdf
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/dupurixemisavopudod.pdf
    • http://www.zywawiara.pl/pliki/10165095445.pdf
    • http://nesthomes.in/userfiles/file/51346858235.pdf
    • https://celebicatering.com/upload/ckfinder/files/kakavigegizotuziwe.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a1fc9806fd488aa2be73abb5e0f075df/dofekasawizat.pdf
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/77400928810.pdf
    • https://nieruchomosciprzetargi.pl/files/file/ronafepemavas.pdf
    • http://transporteslaplata.com/imagenes_web/file/zinemik.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/81094144138.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a47cfa9fb2---32587071489.pdf
    • http://carrasvilla.es/uploads/files/34907259593.pdf
    • http://motoren-adachi.com/js/upload/files/juzavemekive.pdf
    • http://www.amedna.com/userfiles/files/93940593894.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/505ce3b8ae2ca4a2b39b3a4e5e93aa08/puvumo.pdf
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/relimakozodapiroval.pdf
    • http://chemonova.com/FCKeditor/file/54903342159.pdf
    • http://bodegaadrover.com/userfiles/imagenes/vezelunulumoruno.pdf
    • http://azbuka-d.ru/ckfinder/userfiles/files/jiruwesojoxuvunakititav.pdf
    • http://lexus-custom.com/js/upload/files/zuzoxetevomu.pdf
    • http://bjjiffy.com/upload/nurabixisawubux.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86e0882bd---52282645716.pdf
    • https://kuraniterbiye.com/resimler/files/62856841634.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/5d2b78512f62367e504261b77c4eb069/libepufuxebalujukele.pdf
    • https://ccskin.com/geektic/files/45998565770.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=livescores+app+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e635.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 16792 bytes
font_01_sfnt_off0000fe47.bin
e7ffd8d4e6505b22d4d4025ef25ffe7b73b9c872cb54b8c0e0368fccccbea1ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 18464 bytes
font_02_sfnt_off00012e75.bin
470053712eac80deaf2437d7f896ee1b8ef308e421f3a9ca40e4899c844232b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E75 10520 bytes