Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa8e9c64749d48c…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 04:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d9ca41902a206ad017b0dd6463d12506 SHA-1: 7b53dc4045f0374c2eb7d9b3f287de888e5a1475 SHA-256: faa8e9c64749d48cec8fa5a38e9ffaefc78c8e5bee8c43b749ea30e02bed55f4
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to a variety of domains, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is a link farm designed to redirect users to potentially malicious content or for SEO manipulation. No scripts were extracted from this sample, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://philabc.ru/uplcv?utm_term=drawing+using+different+kinds+of+lines PDF link annotation
    • https://www.eos.org.eg/ckfinder/userfiles/files/nukogo.pdfIn PDF document text
    • http://tajilin.com/upload/files/97358132673.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/85244952974.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/jln5477v34oemld45mge6p0q5s/37687568524.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/doterixamonura.pdfIn PDF document text
    • https://webmenuplus.com/images/file/wovujaripufevunolezazero.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/28350468367.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5ab633c09---85416426080.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/89362650457.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6f028f70c---10927985660.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/40950557880.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136bf5776d63---48918314461.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/75914782519.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133035bf0e2b---wuxiwipakawekibaku.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/58184139444.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/75353795934.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2jb33amogtrpo0sgsofbl9pvms/90296047247.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/18934146552.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/mukunebovosurosirujojofo.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/10354479282.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/8rndbe2shvdh2qbkq6qlfobn00/3548795040.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/25177424871.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/24852204311.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/31685178092.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210906011608_jknfyr.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/39865495286.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/lolewepatitajuf.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_off0000d9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F9 10808 bytes
SHA-256: 9d7f03cfc8a45491c08a1401663cc8ce75e1245bc6861d4f28222b6a59cdafc0
font_01_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 19040 bytes
SHA-256: 93a7cda03d58a223c0480d2bd27d27180177c1bde3c237a474c536efc1fd9197

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