Malicious PDF — malware analysis report

Static analysis result for SHA-256 7487e42edcde4c13…

MALICIOUS

PDF

70.6 KB Created: 2021-09-27 21:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb32763cc2c25165ea6f02f63f8b62a8 SHA-1: 1a445d2baef3b347d529618fd4b17b81a221f47d SHA-256: 7487e42edcde4c13dc5652f224a4898a4b6da7e83d9232aa0ffd65a83ca054c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of embedded JavaScript and a high ML classifier score indicate malicious intent, likely to redirect users to phishing sites or download further malware. ClamAV also detected this file as a phishing trojan.

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://drafthe.ru/uplcv?utm_term=zxing+barcode+scanner+android PDF link annotation
    • https://fond.ru/userfiles/file/gufuboxufex.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/12671872984.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/rivoxexuwizukuzakipen.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/zaburowugenipajefo.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/moromunir.pdfIn PDF document text
    • https://cowik.pl/upload/10659893569.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/mubamojibas.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/demepelidivobudepax.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138416819b45---40061043684.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/pixejamurisuwuno.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/gadiwu.pdfIn PDF document text
    • http://zeci.nl/im/image/54028269962.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/kerajugixuvomofen.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/61660429449.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/5249989938.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/zizubakizugitoj.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/38640729392.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/dawisenoboj.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/73174345714.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141a9d16a7fb---lilowopedapatabu.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/koxavux.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/womutasatimavemuk.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140cc7378ad3---39012575473.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/parekoseluz.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_off0000b157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB157 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96E 10604 bytes
SHA-256: faa0968a462c394c35cd8d8e74f6f6e1a45f02769e7c685bebc9ac9269afc140
font_02_sfnt_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 17020 bytes
SHA-256: 7f2e7678dd54d9cf623e951ed2a286c9db8a55dcc5d108774f69420e9f52daa0

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