Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc459df8b89c998…

MALICIOUS

PDF

82.9 KB Created: 2021-08-16 15:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e64f2086d4b13733e8a41c846ef2182b SHA-1: 5c2b069fa7ca2efffb8f4ff04b5a7fef71d6b3f5 SHA-256: afc459df8b89c998583b1aba7ad3c3e864ac4b281b046caceb8e733544bc7df0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by an ML classifier and contains numerous links to external websites. Several of these links point to compromised WordPress installations hosting other PDF files, suggesting a chain of malicious redirects. The primary function appears to be acting as a link farm to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8a3e2caba3d93519b801189965cba118/87833833919.pdf In PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/kk53mu9ofk76tb4r714lmlj4qh/posafowukexanatoze.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609584c25967a---73851225520.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23612a1e2---fugugurezunisomomatuma.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/77452801150.pdfIn PDF document text
    • http://suurelepa.ee/data/file/vumivetadegifi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa9e38601c5d6f954c9b8ce5d2a148d3/25457265206.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/33592870293.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/torazowefuwumanin.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/64999631848.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dddf5466244---pagojanumapunivuvo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f076167be---kekigofarig.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/sugebitemepexexulupivumez.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161047795a5d82---kowozup.pdfIn PDF document text
    • http://aven.su/userfiles/file/suzurojowinawizumeguxaki.pdfIn PDF document text
    • http://mesahighclassof63.com/clients/79820/File/16035889101.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9afb465c2---tewib.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/34900592913.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920ddf5fb00---23841634009.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6786f26f3d---dosajewame.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b21b2fb9e---jubezesir.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/94819112303.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f46c0e043---51297454569.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/olre07210fupok0sh2iqberd64/5842535810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=oposiciones+para+mosso+d%27esquadra+2021PDF 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_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 11132 bytes
SHA-256: 37ba1d29d2fb8db11c3ae1ff51eef6a389b51e275e3d6a4d0057fa0f5ef58a1f
font_02_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 18184 bytes
SHA-256: 863d11a514a97244f4f810cdfef62b4e4d5d82a8fc5a070a6490439528e4a335

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