Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7d522af098e78d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 16:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cc3fb888261008744f2acee94d8d2eaa SHA-1: 898ef03dae5f3682ec22fde6e3b98814938ebc22 SHA-256: 7f7d522af098e78dc8ae9df52fe0b512087cd4f5eb8b12222ba1b8125cd1d29c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

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 https://allytemp.ru/uplcv?utm_term=watch+the+hitman%27s+wife%27s+bodyguard+free PDF link annotation
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/jevuwudopusuxidifet.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4t955ugr96g59difuflps1g4q4/77760941835.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0907/75c205de80c66ed0f4e4bb4978de967d.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/zujovojifakinavavexupo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/031708a1549027e1c0e410e1b8c8bb47/22678819761.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/dewixi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/dsj1hgalj2eq4pkub612ou4n8n/giwugeg.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/bapogewogufunufunev.pdfIn PDF document text
    • https://cardolf.ro/files/71101666361.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/rofolepetunonovezefojipi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131009d24e4d---zamawewujedi.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/zomamikaxo.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/dad42b0899ac5511592c46d9d65960e1/kigibokulibu.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/49734083296.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091413471174.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303da160b5a---nekugivitow.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/bafewexiviwuvum.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/79125597321.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/89155372196.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/58616889947.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/77969801187.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/93821066450.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/kegezojodiremekojusufuvo.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/nopipavanarigov.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f7381025---wowebasepelasatixas.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_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 18600 bytes
SHA-256: 21983484b914591d5c34d96f9e2370aa7f77f78f632580cf2a7da149d4377215
font_01_sfnt_off0001108a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A1 11344 bytes
SHA-256: 538e187f102bdef5c42c408c1005d740c56b2ec1369ffddb1912f0142137d7e6