Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e5347f35161bccc…

MALICIOUS

PDF

76.6 KB Created: 2021-08-02 08:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3bdc5bd828d8af59125ac046a2e2746a SHA-1: da4b1224be2919d4271a1e0efac13e09a6eea509 SHA-256: 1e5347f35161bcccc1be6d02c84a9987955d4f76601a63efc9e1bcbb3eca4d7f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a lure for users to download a password-protected archive. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and heuristics suggest the PDF is designed to facilitate the download of a second-stage payload, likely an archive requiring a password provided separately.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/kpa7a1m15kf40ji84gkd8cn9dq/jipan.pdf In PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c5487cc10fc731bfa674de94056609ea/767635007.pdfIn PDF document text
    • http://fields-on-earth.com/vazijinosemazuvotijuti.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062112433419.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9894547a8---relijolaxerudisamifemob.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/20fc748af75da1ac0bec3cac9abe22bc/74347918911.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/82805249064.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c815362ea3---61031268356.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/sulit.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/49867889445.pdfIn PDF document text
    • http://aven.su/userfiles/file/sitev.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/bsnpsog7s44lusiia24ch582fc/zodusulevoluluwugobekogix.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087057379612---mowegisiboxemudukagofoji.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/keroba.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65d7988b5---savevatepofexelirigofaga.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d312cd622a2---xaxuros.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mot62c2l88fnoh26ugmu1bmc7s/14167266578.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079485a6274c---zatesaridifojazuvin.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607186c572539---manisok.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb275cecd2---40118778322.pdfIn PDF document text
    • https://lemanssrl.it/file/buvegubudedume.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/71386168562.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/terinewiderosanoti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fisica+conceptos+y+aplicaciones-paul+t.pdfPDF 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_off0000c935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE147 16952 bytes
SHA-256: 8792b88435eb703bfd3c13116a2f272c1f54732df8a366506b8505f396b77add
font_02_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 10804 bytes
SHA-256: 59ef87042894978e31711d2c985974f6f7dd4bc984b91f6333bbfbfc36e11604

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