Malicious PDF — malware analysis report

Static analysis result for SHA-256 e545ec9cbdc26d59…

MALICIOUS

PDF

77.9 KB Created: 2021-08-19 19:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 46c2ef5715d9c5b938d3b53aa4ccd86d SHA-1: a2c181b051d2f69b46b48f266e38af49c14f0682 SHA-256: e545ec9cbdc26d599172372d3a79eef0ea65fd00af1bb1deb70e91b4529ccd85
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. The document's structure suggests it's designed to lead users to potentially harmful external resources rather than providing direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://a-pointpro.com/cms/ckfinder/userfiles/files/sozorifuje.pdf In PDF document text
    • https://gbagencement.fr/uploads/file/73186293990.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/8a38bf86b9a3b7b498f46965a95236ad/95815248385.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/14777854951.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/gufajijure.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ep2h2ttjecea2hlbvmf7q7umpn/54702062900.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/zadimasa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161091b03496e6---suruxupalopovezavago.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe1110a09---45036953032.pdfIn PDF document text
    • http://nature-revive.org/files/file/45621341993.pdfIn PDF document text
    • http://yuha.be/_files/file/32438491994.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hnr90pm2kgkfv44bd70b5c43h1/73955610967.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/mejatevubipisutugepis.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/fepademoruzi.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/vovagogi.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/64903189104.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/9283c2c749f98250b57874f10bc0d2de/baredabelagufawazibukuw.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf03cdfbdf---duvefid.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/4dbpgv8mt0poeda5id4nj2vifm/lopizebevo.pdfIn PDF document text
    • https://primer-spb.ru/files/files/60348338615.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4adf5f947---nidakilujevasitovevewure.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/42072867233.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c263b215522---54341826856.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864a2cbb520---tonolatujiwoxukas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lightly+row+suzuki+violin+book+1+piano+accompanimentPDF 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_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 11488 bytes
SHA-256: 4a6396231232ddd6493b5ea550390d41ebb4899d773225846a3d8c4414a8433d
font_01_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADD 16996 bytes
SHA-256: 7080e3d92667c54e3d1a39f6ecee8ac60b0ebd9f3adda0af8b0f9e9c1d472291