Malicious PDF — malware analysis report

Static analysis result for SHA-256 382765e8488c20ef…

MALICIOUS

PDF

82.3 KB Created: 2021-09-17 05:50:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d7a6572efdc89354d6eecc5f261eab3 SHA-1: eb067b53d7e8c1ca558152a42a63eb0cb98374ac SHA-256: 382765e8488c20ef868399d8a9bb5fca98df50d80381f35eef5cbcd1942f2fba
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates malicious intent, likely to direct users to malicious sites or for SEO manipulation. The presence of embedded JavaScript, though not directly executed in this static analysis, is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 http://xn--9w3b270a7kf.kr/data/editor/file/ratote.pdf In PDF document text
    • http://mazdooradda.com/userfiles/file/5471162562.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/2202376942.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/kiwowuropurirunupejexewa.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210909/file/1631159417.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/kiwumujenekefe.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/lasegedawod.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/junabokunuxutazitumi.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/30857492021.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/86072300813.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/desibimavawazijizola.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/78805171811.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/kefiru.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/widosibavubobusiwaweb.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/xerudi.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/jideviwiromoridebelo.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/35351621030.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2863db248c093ccaafa1579fd83755be/16674636473.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/24835400951.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ab6b1663e---zaripiwarumimomenonuz.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/rojezazig.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426486edde7---kibumemifobov.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421a44369ca---94538144847.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xunosuxobepuwukawunovas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=contacts+automatically+deleted+from+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_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 17780 bytes
SHA-256: 7989fb547ba48b0b4d6e01af4a5ff3d34a6b0caae55a1cac97db416ddb9efd43
font_02_sfnt_off00012276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12276 10884 bytes
SHA-256: d0ce423f30ae2abfb55d69a6623882c7920ac8a0715f704b6206a7b3a727c360

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