Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2f3da4aadb1444…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 07:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5e66b812fa9d5b7f4f74272130c7d974 SHA-1: 46d7f651297f2c68df299ee4161ba96f185ead2d SHA-256: 7a2f3da4aadb1444d07cfd8a098ac9fe64cf9e3304d0b4a876516836eebd4ba2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier strongly indicates maliciousness, supporting the assessment of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://pistant.ru/uplcv?utm_term=to+give+simple+past PDF link annotation
    • https://cissud.com/uploads/ck_editor/files/88390237621.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b31a5235---ligusupojuwora.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/n9cbfh205n61b8g7bt5qt8ira6/moxamuvukufa.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fb812216---21699250526.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a3944506b---vuwuluj.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/velumulezikomoji.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8281bcff57ef72fd66feac7e7c6ca91f/nokuvedalaledelojubu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc1cf3a3cc8---26312168896.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/71797963271.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/lelog.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6957e2946c9d71cf6541c1ff25f95c9d/rugexelo.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021081822321976.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e115d8119---66961247888.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/75193536513.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/12633494321.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/runovovivubazabapudijo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ccf71421c27c4317e264df8be625975c/fitelagigevawiwasuvosawej.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/38815669066.pdfIn PDF document text
    • https://langumeistras.lt/i/File/boredademolumuzu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16079d74617382---33893179115.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/jt46c21ijrmr8le1fa80qcoq5s/13509358385.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/79ee593854c87fa99ad474f7e1f1b28e/nibumo.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/jefox.pdfIn PDF document text
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/29219857705.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_off0000c488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC488 10420 bytes
SHA-256: 17ef77945d18dab53d6bc5adcd9b16fbcb9cfa49a6ef9a71bec59fa93a4018c5
font_01_sfnt_off0000dc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3D 18844 bytes
SHA-256: e8e7bd9b338ca666b478a97ae509c158494d2e115e906a0d67312a6d982b6294
font_02_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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