Malicious PDF — malware analysis report

Static analysis result for SHA-256 e343cc5eb6fa7a0f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-15 11:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e738c7648da0792730464b0c9871fd1 SHA-1: 94d1c84ef1cb37f5dfd5fa4d6089cadcbca70209 SHA-256: e343cc5eb6fa7a0ffa7b8fa1ce40fff6a19ccd2503613ea5544e1be5585a19bc
96 Risk Score

Malware Insights

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

This PDF document functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect the user to potentially harmful content or phishing sites. The document's structure and the nature of the URLs indicate a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=my+name+live+wallpaper+apk PDF link annotation
    • http://hftyby.com/upload_fck/file/2021-9-3/20210903084739448030.pdfIn PDF document text
    • http://gzwep.com/img/file/202191462610.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/tarekafikomunonizisetefeg.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/rinebalonijilakorelofu.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/75078684652.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/76bc976631953dacab3edd60fa918b9a/nitupuvobiwirov.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/lorosivupurebubodabodogi.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e53f356d8---91923797789.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/88663057895.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1a9462ccdde95f478811097814000fdb/99935887552.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/pigomubavivasobixeje.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/vifejujibaduvefej.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613173165dbc1---vuxeduxokolurafeves.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/943ed18601c0cb9f4be70a082994ebf2/delafepavilugo.pdfIn PDF document text
    • https://satesayap.com/contents/files/75604986883.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614189c69db01---74993260631.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6289cbdf1c7357d77d32b55f911e6fc6/jetureg.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/jexebulogi.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/81740919022.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210911003049_iofa4o.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb968d831---tulebipaxisusovemun.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/89265725800.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/85240373033.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/56049298589.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_off0000bd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 17128 bytes
SHA-256: 970cecde6a511c009365e5470592fa54f800fb15c99d64e7bf19ef84229aefbc
font_02_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 10376 bytes
SHA-256: 68f9d60c9f0c328d2eca216f5324d86253f4b6b1b77beb5fefdb73cce0fcf1ec

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