Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8e00e7030ae1b3…

MALICIOUS

PDF

135.0 KB Created: 2021-08-12 12:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b7d5ea74273481589a8ab826f2738ca SHA-1: ba3a8029f0718250c4b4265a05ac4d6e9d28b521 SHA-256: cd8e00e7030ae1b3854237c425b2ec8f68057936c3db1e71c7489b7cdfb0d07d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d44725695ae---19633852066.pdf In PDF document text
    • http://abwmercury.com/uploads/files/95389208517.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/h1iu5lkpgn8tlt4n0esn656ts2/50566278969.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/398300787e4df9e0080f5acb1ca70fca/sanebipeg.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a566fabc13f---lomibubadisesofi.pdfIn PDF document text
    • http://www.emailposte.com/pictures/nugew.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/sir2od7lp20ufbbjb6s4fded9l/gezebexonadasusef.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/2433039534.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/fumuparikafeduzuselejog.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/kudaxagilukisapavuzo.pdfIn PDF document text
    • http://omak1968.com/clients/71178/File/bewazibuwase.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/83685625282.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2450108a1---45393900612.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/jifepokunevelaturu.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/90218588733.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/sabirafaxunutasawujenuwos.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/d21ca66cf47824c599d467bceb450255/xomexibelefiwugeruliw.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160985e8c8c47f---49350874710.pdfIn PDF document text
    • https://vestol.bg/files/file/dejadaralikibupotasove.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/52320804173.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fadec84896d---ginetudugagadevuje.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef35504bcb---xemikina.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/9e3f29ad81234cb5ab0585cbd168e695/devudobuvaxejiruja.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/65d7c1b0f26a5402da9a98df7f5fe2d6/diwudopuperibinobusabefom.pdfIn PDF document text
    • http://skupka23.ru/upload/m/1522021112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+long+does+channel+divinity+lastPDF 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_off0001aaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2BC 18468 bytes
SHA-256: e6ec7bad4bb5fba1f6cc2b521d70c5d1b48d77081e53626636cb9042bac20315
font_02_sfnt_off0001f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2C7 10808 bytes
SHA-256: 43ae85b8909cff887fce5290d0a2f401710cc1dee0e51e15e9e4ffd98654999e