Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff15bb6a742bc277…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 04:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53cd64cd67be819c16ca94ae41426c17 SHA-1: 776489eea530540d77d04e4ad41df801d4acb6a0 SHA-256: ff15bb6a742bc2778c7cd97b917f6610a8b45d39ccab13d27add2249e5efb895
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=fortune+id+minecraft PDF link annotation
    • http://varvshistoriska.com/file/daduguvivamasebomes.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/77007409361.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/nobadategugisa.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134775036d10---10841237235.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/sesujunivobusakuno.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/tidufa.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109061307166531.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/85716410683.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/64541466847.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/77468068491.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/rulorosakozenopodazo.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/75345078345.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/25041981579.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/29409912285.pdfIn PDF document text
    • https://music-group-store.com/upload/files/68984552110.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/44363359669.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/71422358109.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413a6599afc---62871917475.pdfIn PDF document text
    • http://torgoborud.org/images/file/57109482951.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/8708557451.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/23967704570.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/23065024558.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/wewun.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/22300478715.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/ridotajamesevesir.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_off0000c1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F0 17656 bytes
SHA-256: 75419f3feda969119957750d796fa37f8b61b339bda5aaef084e8191f9fdebf0
font_02_sfnt_off00010814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10814 10500 bytes
SHA-256: a073c92b167e103524cc6ce43a6b0b6e469c6a407baf0269fd3757e85a427825

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