Malicious PDF — malware analysis report

Static analysis result for SHA-256 676f27c14bf836b4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-05 14:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c54b51c77247fdc85a3fe8f5a292fd97 SHA-1: 9e15a9733d1cd5b6abd494c430fd93dc0b90c316 SHA-256: 676f27c14bf836b4673dc65bd766a3caf3d17bdceb2bb2886fe66eafe5b44094
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=borewell+recharge+pdf PDF link annotation
    • http://www.climatisur.com/ckfinder/userfiles/files/68413623842.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/waguk.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/30116703736.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e2014d7a---59855794565.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ecdf45c87---2894723986.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4628b5bea7---vesojidedajefuj.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/nozigufemog.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dae7166c81---lewiwejitemivu.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/jomow.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/56039319430a488dbe2d5d1268a84f6f/87554000655.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/pesilasikivasileri.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a3fc6702740d706eddd0b7c8a20838f7/pavoluxatesunixekejite.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58800550d---tamularatenoweb.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06c29d4fdb---bekexerobogigo.pdfIn PDF document text
    • https://webmenuplus.com/images/file/dupeguxinale.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44609cc2d9---kiwosofirazofipo.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/vudosiwaso.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/8550480056.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a8880a8a---rekuwejos.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/61325933472.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/18359484149.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098a2d6a5f12---kobedekubadasojaj.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbcbd12d55---xewabaterivitezaximawi.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d78ad1c86---52641797741.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_off0000e1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EC 17352 bytes
SHA-256: 33c0752b8a5ebce92e9d179aa4a20cf176ea56f0bff9456182dfbaf4bc4c8251
font_01_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 10576 bytes
SHA-256: 6d5d80458aec298f6b28a5c27bf1de8773f3c5bc05c2e8a38462fb521179a609

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