Malicious PDF — malware analysis report

Static analysis result for SHA-256 c513de23200bf1d6…

MALICIOUS

PDF

125.7 KB Created: 2021-08-07 10:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 47e84f5581fa122dd34c2c52af3a03c8 SHA-1: 0ceb58fcfaa9a806480b1ef61ede5268432741d0 SHA-256: c513de23200bf1d6a683c6b1616ba7a3da5bd3e12c440a516a7cd532cd86a16c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' lure and a heuristic indicating a password-protected archive handoff strongly suggests the document's purpose is to trick users into downloading a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=cat+goes+fishing+game+unblocked PDF link annotation
    • https://universal4shipping.net/userfiles/file/45022136229.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/c2c62920b0a2ce2304e0496bd0f2e145/69360810484.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6tkijchefli1fk67dlvcmdog98/20808903380.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/o5ghf0m2c6asl5dhqeallreag1/7196333560.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/kopuk.pdfIn macro / runtime command snippet
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c781eb6687c---82374819858.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/sizisirub.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073d4c696012---wulazononufifigego.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/nasakezekupavegopok.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/magosejaritawalekijef.pdfIn PDF document text
    • http://gtshotel.it/images/file/42339032873.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/pajozejivowego.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/mgivb4esh2ajlnrghpp10ttnu6/soxujirezenefokejo.pdfIn PDF document text
    • https://magerp.org/upload/files/zalav.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/5014508093.pdfIn PDF document text
    • http://xtra360.net/campannas/file/82669532357.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/pipadujisupuxemisez.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24020b4e3d---siziduzimemigis.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/77b6fecec6f7ee32c2b4d843f71e0c4c/78439224014.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26d7a4cde8---94394406937.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/gavekadukowotef.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/joxifonivozepa.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/45238927538.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/13968190861.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/tasasetivanogixogufozemaz.pdfIn PDF document text
    • http://planbmedia.hu/files/49222537805.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wIn macro / runtime command snippet
    • 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_off0001845d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1845D 11188 bytes
SHA-256: 9b72529965ccc084d7bb43c06214cac543384beb8e25b64f4fa3784538af72d4
font_01_sfnt_off00019e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E23 19068 bytes
SHA-256: b108b93aa09c7250fb296e1e995d0dd22fd29b292098658e1d23d3fe8e6d027a
font_02_sfnt_off0001d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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