Malicious PDF — malware analysis report

Static analysis result for SHA-256 2987de7d2d56df30…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 11:20:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ece6a5b6f18eb73629c88deed1246434 SHA-1: 282b7b133b4a216bca0005b4775aa4a625a5c68a SHA-256: 2987de7d2d56df30d191f587fa6147e70ed89ff24806aef89bdb012e200164d2
204 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and numerous external links, many pointing to compromised websites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts to trick the user into installing a fake browser extension or update. The embedded JavaScript and the nature of the links suggest it's designed to download and execute further malicious content, likely leading to malware installation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=funny+hunting+gif PDF link annotation
    • http://studiopiergentili.it/userfiles/files/pazezurezebenapovubudafas.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/vaveputetadanos.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/nekolefodob.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/pofalinujemag.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/11f8d8eef8b0d196bfa5bbad9c13576e/18233847111.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/potebis.pdfIn PDF document text
    • https://dptech.vn/uploads/files/xidovefaxidefifusebole.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/mosavewujomiw.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/torefu.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/runagezodilif.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f8af95358d693b1cdf51f77cfa40acfb/9020600174.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/65189883184.pdfIn PDF document text
    • http://skupka23.ru/upload/m/69175637386.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/delodajok.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/bebedeja.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/catnpslqp18b92amfld6tdpjn2/zafetuzagaruseraxaxi.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613852d1eb67f---39205542897.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/vufabure.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/6355589118.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2845bd2cf2be477589599211ed5ce94a/87309258178.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/rilixusuw.pdfIn PDF document text
    • https://trieurodata.ro/images/file/belevovaz.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_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 9956 bytes
SHA-256: b70104419d7e767e27c50286869e12b341265cc76d98ba6440383da1e19b03c6
font_01_sfnt_off0000fda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BB 18096 bytes
SHA-256: 2e98a1edaa4e92220b81913d4f4cdb78c037d412be0f5ba5e29d841b03043c4c

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