Malicious PDF — malware analysis report

Static analysis result for SHA-256 535a7c22a7d1c631…

MALICIOUS

PDF

82.4 KB Created: 2021-09-07 16:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 62539aa0a92f1e30992ab257ac8b7940 SHA-1: f5d465452eede1d1f6f4ea2f52dfb0afea03b858 SHA-256: 535a7c22a7d1c63148428a2f53469c90c0391b1041f53d87a1c5d195a2ad9cd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of a 'windows 10 product key free download' URL in the feedproxy link further indicates a lure for potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/aa1d69e129ba25cdfe559692a382c71a/bipuvunidojevu.pdf In PDF document text
    • http://bensonlandscape.com/editorData/file/87529711021.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/fifoleburukozos.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/11876791969.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/nosozuvunuropofa.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/8209660165.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/retikowaruresesarupugazif.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d58f49f34d---foduripeb.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/76399920306.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/nufenatomirurik.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b6c02de5b---nixirulevizi.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/lizozowegolafurone.pdfIn PDF document text
    • http://dezis.ru/uploads/files/luxirux.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075942b7e229---lisusipure.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/6btp2t1u61q62b2ea7hop3dc0v/31106527483.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/kazavafogituvaro.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/viruvalowavosuforuzebupod.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210706_2C57F90AFB6A2004.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/76119484563.pdfIn PDF document text
    • http://tyextractor.com/d/files/86367995900.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/tibedov.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a822baa0b5f---90035162563.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/74623225213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=windows+10+product+key+free+download+pdfPDF 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_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 11172 bytes
SHA-256: 5d5e43959cd67dfc2623ec5fcc8e0908ef6fb52bebab22af7cb92485f6978a01
font_02_sfnt_off00010f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F80 17120 bytes
SHA-256: 669496023cc215fea04f03edd046deb57fce9ded5725c70614c36927c8a90449

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