Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b5f8ed897bd072…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 16:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 74cde39ca8f798665a217d810d9362bb SHA-1: 662f66ed642ed9dfb534af0b4097ca622c179ae5 SHA-256: a1b5f8ed897bd0728a50a8be778f8519079f7961dfaa70209c7362b01aa477ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The presence of a 'converter mp3 youtube para android' UTM term suggests a lure related to media conversion, a common tactic for phishing or malware delivery. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://radtel-sport.pl/userfiles/file/dujotelu.pdf In PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/turutixikelu.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/92379706185.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/91352469430.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/karepitop.pdfIn PDF document text
    • http://p-energo.ru/content/file/40470737342.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mi2dj05nh71edoo05mdvg15248/gojijujavuboteruwalar.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/gibatamepotixuro.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614096c606b7a---videnitepugimetidapex.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/9590449821.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/xokebejowuvawosopajitufi.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/75167487675.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/75961956070.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/11801085050.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/tidituridopajatowixuse.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/jebelo.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/ab063d42154991ea7e0f573a4656df73/22180794838.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/dukaviripebigujen.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/xenipagilotinapajede.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d22cb556c---muviluxotus.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/2d30cecac5c8ecbb7fd9d66dc11977f0/mewozobumazus.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/ravanijefalinuwugebej.pdfIn PDF document text
    • http://amandamaitland.com/images/file/jilakamebixisewize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=converter+mp3+youtube+para+androidPDF 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_off0000afea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEA 10964 bytes
SHA-256: 7b44cf7826d8849c1cf1d964e6760cb76649555f4209df1dce97609a3d8afe14
font_01_sfnt_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 15744 bytes
SHA-256: f75c1ba44b2b508fd959b1d3da09047c4442a544de47a5d5c34474aa8c4562e1
font_02_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1