Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccb53950e2d9a57…

MALICIOUS

PDF

71.3 KB Created: 2021-08-28 13:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf1ea388a1e4267ffc8ca188a8b29eb9 SHA-1: 3a91a147d9c39b4a23ef15d4974ab84079390293 SHA-256: eccb53950e2d9a5713d08d54dc344781e5f5c33e5da8a728d858453f7865f140
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to act as a link farm, likely for SEO manipulation or to host phishing content. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://infrive.ru/uplcv?utm_term=diet+to+reduce+cholesterol+and+triglycerides PDF link annotation
    • https://filetorme.com/upload/files/61000245329.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/uh05mmnogakog1o6ek6ur697nf/paramefudaxazanudaneg.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/06c81b2c165f27fac5563bfef87e1870/62529781528.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160815dea34255---ginexubufisomewudojaporo.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/35139018468.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988cc13d7f2---37740816526.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/fowakolulovuravenupipuka.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/mabetegemusiga.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210821161439.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/94206446481.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d40d40eac13---sirugajawilulerajorov.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/vofowos.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/18988188654.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/viluzob.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/28098092742.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/39873926637.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/pajipitaletar.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd53a244005---80328653995.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/14519152641.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nenigumiben.pdfIn PDF document text
    • http://normandyclassof79stl.com/clients/e/e1/e16d7b8530e96d8d426d6b963c92b0b5/File/nutojab.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/79823390568.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16121ad8af3372---bokibagebezewegabeduvi.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tusijaputojiru.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160defdc0065ce---jokixilut.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_off0000b9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E5 14424 bytes
SHA-256: 661837ccd37121638f4b1028856e9a0b3587d05bfb2427887a84c1b8b7c3b568
font_01_sfnt_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 10864 bytes
SHA-256: 4dc056aea12d0688bd84f5cf91d001da1947b547577e2c948c272e95ebeaa33b

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