Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f83c84bf3a1675…

MALICIOUS

PDF

85.9 KB Created: 2021-07-12 22:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a427eb8d276f547e5f4c60dd458cc51a SHA-1: 62d6ca76fb847a22b07fb92bac7df077b8aa68c5 SHA-256: 25f83c84bf3a1675a487ca097bb0547d6242266c8bdd3ae4365a92a82dcc30c1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is flagged as malicious by ClamAV and an ML classifier. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The critical finding is the 'Clipboard command execution lure' heuristic, indicating the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. The embedded URLs likely serve as download locations for second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://medvor.ru/uplcv?utm_term=copy+and+paste+in+autocad PDF link annotation
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/316cfb71c4794df346bb33cc90d48f97/linatajexojebu.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/53432195504.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/somuvujuwiwaxon.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/15565971647.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64b3c1ac68---47844894232.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084459f62fb4---ruwaraferum.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/volalerobepugewevatukorom.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/nenenupudenusi.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/10b3446c3806d02e800303b18ad9c23a/xolexosag.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160893e210a701---54739550747.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/14452169845.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/58264640838.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d845415a7---31437015595.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3bq9rlm52ve119qb27n4t08qn3/suxawasokixa.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/95420197365.pdfIn PDF document text
    • https://tessuno.com/upload/files/60d7f94a186f2.pdfIn PDF document text
    • https://parc-hotel.info/file/84447002258.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f046c66944---mewewibevinorelinorenepe.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/2fi941plb5kks75pdem3rrb69p/78762468858.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/65083197369.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3c54b5e41e5f35ee00f20478c16c6621/demulotubunufa.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/cir773ba4ejupk561jjn0k8ae4/53722681740.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0898cc849---finapasofefe.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e9928ba95---74674345018.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/ea8e85e17dae15eb6cd77baa8f80cbba/3235558945.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/88278478112.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_off0000e8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FC 18532 bytes
SHA-256: cb94bb67f3cfaf62441a9f544710bd9ba8da7c0a302525b6ada7d6a757bd2987
font_01_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 10604 bytes
SHA-256: d233a378f77bd381f50c1adced48574cb36afd9288d54aacf52471ae4919e2f8