Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4c8c0bc06ef837…

MALICIOUS

PDF

75.7 KB Created: 2021-08-20 05:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 70b909a3414a30b7bbab028bc8d31ba6 SHA-1: c00238783ca499222a2717ae54b45e3b8bbfb89e SHA-256: 8f4c8c0bc06ef837ed03487c5da777a06f49afa7332c1c9e0a51520181b30a68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4467acef11---13373726850.pdf In PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/esu9lh8l0mbd5u06o4oo5paqi3/16524854729.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/6605397730.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/7640786756.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/1584514879.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/73599495086.pdfIn PDF document text
    • http://iasvn.org/Images_upload/files/41945850696.pdfIn PDF document text
    • http://haileylusk.com/clients/e/e6/e6412a3df854040bfb282c4f37eddf02/File/dederujoses.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/1j6sri5e0gt194fb7e5f2ikufm/fijumilixegebulefiwim.pdfIn PDF document text
    • https://whitesal.com/data/images/file/6776_20210607120548.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/nuzofakifu.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a525faeffd---74898716181.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/banexedofeji.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610caae278de6---44471807384.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/bolegilokasiwegux.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8cf51fd5015dd9061c5159365b47ba21/26122657000.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/xipebiwibo.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098904356eea---66405351399.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/45261978760.pdfIn PDF document text
    • http://ikoi-es.club/yamituki-n/uploads/files/munovebo.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/62336509855.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/pifugizurotegizizinov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=veer+zaara+full+hd+movie+hindi+download+filmyzilla+480pPDF 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_off0000c17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17C 16420 bytes
SHA-256: a09901b72759696f11d05dfeac012defef269684d1295e3b022ba59a5c2d7859
font_01_sfnt_off0000ec20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC20 11300 bytes
SHA-256: e4ade554f9e5a77cfd59a0829b3ba20aba58bc66b92439fb401ace4dcc55031e
font_02_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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