Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86583f6ca56ef3e…

MALICIOUS

PDF

86.9 KB Created: 2021-07-14 00:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5b56d51abdb9258898ad74f71a17f52f SHA-1: df33f25470de9f12f48ef3067dbc03604a858c63 SHA-256: c86583f6ca56ef3e20cd116fe842e6440faf70fd84957e264e12eaea8aecf740
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness. The document body was unreadable, but the heuristic firings suggest a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2903d1414b---kubegup.pdf In PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/hogn2leeat9m2rp5mmucdkk2tg/14236143531.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa799257f31---vokijebosimadek.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ad9ba4d5---roforawuxotupedilonur.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/46866706012.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/zuwamaxawovix.pdfIn PDF document text
    • https://egf.tw/test2/images/file/mepexiribovifejakawogopag.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/12011082487.pdfIn PDF document text
    • https://landbar.com/upload/files/gonedovif.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5d28e44a1---30980701899.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/vibuxedabudinejidenuvuto.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cca636eed---jakofuwesejavepategowiv.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0k9o57g0vcf9us3eh812tpfpvb/rowosuxapifotikuzewago.pdfIn PDF document text
    • http://askort.pl/Upload/file/kukuzituraza.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/jumafirewilovajisagazot.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/wuzulorugexosovijowup.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd309b3a2c---28672378928.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021070709551149.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/82016b46d2d4f9fc5e1825705906487b/24027539696.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/60863922378.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9856da7d5---jenirimevix.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/89906667774.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/vawezozorokoroj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=customer+service+introduction+letterPDF 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_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 10568 bytes
SHA-256: 750c5939eb711a344e3333f2250fb922f58282befc6f175be243fb7ebe1f5a93
font_01_sfnt_off0001078d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078D 17264 bytes
SHA-256: 66c9c8016565452e0bd1c6997e2a69f316b551b015600fd894da29b2c903f708
font_02_sfnt_off00013480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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