Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6fd1213b9de134…

MALICIOUS

PDF

84.9 KB Created: 2021-08-25 12:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12305bf122f792332bc6d71c76ae9163 SHA-1: 23de606c8986c9e0b75abaefa130194ffaed34e1 SHA-256: 4d6fd1213b9de13449d0ccbd3159b1bf3ea78454d0aa4fd417621ac62dab6f93
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links pointing to various external domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is designed as a link farm. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://esoftland.com/userfiles/file/zeranoxugokeboj.pdf In PDF document text
    • http://waterreducer.cn/d/files/todajim.pdfIn PDF document text
    • https://ivaco.it/file/fujakuseki.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/t8snt83slh2o7top3addqdeuug/sotuvabevek.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/38185792646.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609066a029e57---9090475496.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b99a325fc---ratemorojazedifowekuv.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/9408979cc62182a78522ac3abc84cbb4/zifabepirapobibajiz.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/xidarugadafexuxabavo.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/45317737054.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d38112b9f88---toxawabaputabuzuv.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/wisij.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/mabirejeneledokusa.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f147c90a03---2243397086.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/74853bec61f32d28ac84c0ee13d3f247/ditez.pdfIn PDF document text
    • http://wenxuezj.com/images/File/xositofumusirugeloso.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6b92a90ed---xemojorodajevanu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/70c5f9b5bf8f8edc4c9e506e8e6e9991/49138052581.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/oog8j73sqtdbir5r0044g8m7d6/85025382234.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/25213857651.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/tupatesefi.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/37292706696.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0bc82d5af395857824adf8502d98369e/44775199827.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/wirasokasipiv.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be487b38707---13798899663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+first+indian+cosmonautPDF 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_off0000e8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C6 16820 bytes
SHA-256: 7417bc7e448231549431cdfc387b86025f1593d061bc0d2a64b9c4d10fd9449f
font_01_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C89 10756 bytes
SHA-256: 60313ba5719ef3cf069039aacabd35ca75c9b700adda6c1d85ea07a3560881cc

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