Malicious PDF — malware analysis report

Static analysis result for SHA-256 7421f09d0b87d2ad…

MALICIOUS

PDF

87.4 KB Created: 2021-07-02 21:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f8eb08c0628f4d84ba2f86cd62b924b4 SHA-1: 0309abd48780ebafbae0899412d9d920e582b0fc SHA-256: 7421f09d0b87d2ad4a38c561ff23e7eb684ee072075e4a86b6d6ab5744a41a02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier also flagged this PDF with high confidence. The embedded JavaScript likely facilitates the redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/144d0b9f8b381858877be2107c646b23/61403237995.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085c01fe04fc---271179132.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/e0t84dv90o6bbj66d4qgmc5fsi/90246601736.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/48177266771.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/laxaj.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/sulosawejasiri.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/97534080349.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5e1c4a50---65803198153.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/37nl6qhqh2fdgng8urs64euejh/12332195538.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5787219ca---37163894049.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/gojadalugil.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/434afed913a346d15ff4077d7369089a/meroxira.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210606_062229.pdfIn PDF document text
    • http://poorclarescork.ie/images/941595054.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/vowagewita.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5c8d8e5c2---mefegive.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2b3d8adc8---18255553311.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927b185837e---nujasijovevose.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/94819362437.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210619011001.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c90359545---fuselozinu.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/vuzojumabik.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/a2785a2159cee157271ee5f67eba8097/pimegifalavoronuruwomoka.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce169fd6d---1130792885.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c2c495a6---muneboniselijunaleri.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811eb815036---77407527003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=simple+life+cycle+of+malariaPDF 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_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA3 16892 bytes
SHA-256: 31f338907861f21ba6179e091abef29ac666c5fa854b71bcf4f0e018e032e31f
font_02_sfnt_off000138b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138B6 10460 bytes
SHA-256: e9e9dc1c5e425303fd00fada6e6755b046aa9b6d823eddbe67a0bb2080e0e82a