Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6366fe2de219206…

MALICIOUS

PDF

79.9 KB Created: 2021-07-13 15:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ffd285fb6a66d6e037882c08811df6e SHA-1: 2ecbba908d89e79b9e3ed7d366b9245b38e3a84f SHA-256: c6366fe2de219206cd04a92f8f225596cf7965cfbe0a380af6415de7b0ded04d
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript stream further indicates potential for malicious activity, likely to facilitate the download or execution of a secondary payload. The ML classifier strongly supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=factor+out+the+gcf PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/0mgvovvl0cq27lt13pcnup5p65/52443331783.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/nesusej.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66138285157.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/6660fc9f370e9bff9f335e3243125172/zetigigeneromevab.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b05b13538---xilekonopil.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/rafutusadatisuvopeje.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/nozuvarori.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/pezekiremipazinite.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/52604755372.pdfIn PDF document text
    • http://yilip.net/userData/board/file/gozora.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/557ba6822a16caaf7e271929130df818/vaterapiwudewanitata.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/14907376172.pdfIn PDF document text
    • http://talleresjpg.es/img/file/36164803876.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607385381150b---71027102392.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d384c380c58---digiwixiwubiwozenevomasur.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/modijukipaguladok.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c9c597a2---vekopulilonozedepijonatit.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607905b9b70c3---21262161593.pdfIn PDF document text
    • https://limsurempat.com/contents//files/6447324982.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/zokolimomejigeduluvimip.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d71ba7e1c---45016800362.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1991c96b8---65409992553.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a494a64710dfa9799a751752fc52af0e/57520628849.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/54753975058.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_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 10280 bytes
SHA-256: f9dfe2fb35b4d9b6f06cb45721dfb59ecda27fef667fb1c75388d9a9d04b7993
font_01_sfnt_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 17020 bytes
SHA-256: 736f8eae715f6d2ea5fa28277bc059eb17fde079f5ec4a884069f509f6f5f8b1

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