Malicious PDF — malware analysis report

Static analysis result for SHA-256 c189749cb47c545f…

MALICIOUS

PDF

93.1 KB Created: 2021-09-07 00:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89634e09f6df1fdb007e68dc9d5872e4 SHA-1: 260ecee0c5f13d2e90463da24800cb37b79aa956 SHA-256: c189749cb47c545f2891222e2123c333c59c47a4f8a8eb8b9a8d3ba8ef1db4fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=wb+school+service+commission+syllabus+2016+pdf PDF link annotation
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607eba38226f5---67758630293.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/ximuxovawili.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/rirawafiwa.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/panokigiropijinozopebom.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/1357643df7801f9a8bf6897aaf47e58f/41900142973.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d780789067b2cc9e9e5297b5d77b7cf5/81541388467.pdfIn PDF document text
    • http://exima.kr/userData/board/file/zubusesonutavu.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/2394732025.pdfIn PDF document text
    • http://www.toptehnik.si/images/91141365462.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/5htoblv0h1ntbg6243b2l57865/81908412981.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/26295393150.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/roluvepeno.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b18bbc07eb269de16135733294e030dd/71870251697.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7d63b8f9---61701163213.pdfIn PDF document text
    • https://birutelorasin.com/contents//files/dotufagafot.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16129d4603e74f---fofibubamawexitew.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/mifavaxapinuledek.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/24292585613.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/gilupadetukulir.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16088829dc8634---wokovubeb.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/86246661979.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/sexikafanuwurekusen.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f09b6ef0fd---20970846716.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/83557439257.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_off0000ffea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEA 11660 bytes
SHA-256: f77e18fe22d39788a3cf92b471a83167f993220532544f17fc061bb9e2776ceb
font_01_sfnt_off00011b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5E 18952 bytes
SHA-256: 8fff8ffe869b51426f52e3d869d4f58d6e60ea272cd7ee0396352cfaea6dd905
font_02_sfnt_off00014cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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