Malicious PDF — malware analysis report

Static analysis result for SHA-256 087f50ee8125c636…

MALICIOUS

PDF

84.1 KB Created: 2021-08-30 04:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71264d25982cfb85f279df4e83449ea0 SHA-1: f9844e9be0b757ea2922fce4dcb32058aa418b7c SHA-256: 087f50ee8125c636ccb5702b1776454e430a140eb653e11048cd80695edaf81a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a link farm for SEO manipulation or to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=first+period+after+c+section+delivery PDF link annotation
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14febce18f---dikusu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4cb364f3e880840f05dbee34719c9a2e/18301915872.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987aa6af6d5---rikobalazaresumeferam.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/fifadesukopiw.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a78f02a6f4b---3970163206.pdfIn PDF document text
    • http://farmina.ru/uploads/files/fonufofepofinoduwadomo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a656542cbc---67517058652.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/47704745637.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7af284bedd6fc9ca35f661cb212df906/97212246152.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/vowuredulunivonapenakevom.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/redape.pdfIn PDF document text
    • https://csn-alliance.com/data/files/sabopoma.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606e59114aa64---33851640685.pdfIn PDF document text
    • http://mosjob.ru/images/file/84155797581.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/nesenotutaf.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/20332c04e80cc77b01e83f478664a56e/28524290397.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202108261859318931.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/9176402440.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93de63e48b---84467950837.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///fiburuvukowoz.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d09217e0---81047178799.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082993601907---58409109251.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_off0000e244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE244 10772 bytes
SHA-256: 93df35d0a4b299f63726ee1744fc040947a2f9d60a607677913b98e23ee89f03
font_01_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 18608 bytes
SHA-256: 930d658ef16159f15e14649c4a51edd70272b42c7eae1104c623be04ff003fb6
font_02_sfnt_off00012ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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