Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d6f5d33299c644…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 05:05:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: adf2ded24832cb6a814b480798dfe13d SHA-1: e8a337b1f89307bb1051896dd8f100e2b2cb5681 SHA-256: 28d6f5d33299c6441b024f3bb47028c480c90c30509c7ae942ae635d6c890416
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF functions as a link farm, directing users to potentially compromised websites or disposable hosting. The embedded URLs, such as http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366b63c65c8---mewatefotatufanubuwasad.pdf, are likely intended to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://too.kg/wp-content/plugins/super-forms/uploads/php/files/ba68dceeff3dadb665bc3eacf6847946/80650619183.pdf In PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/9403083968.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/54011802602.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366b63c65c8---mewatefotatufanubuwasad.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/dezamidepuzane.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139863fed32a---22651027643.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/11598640366.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/sitom.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/pujaromorinujezu.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/95961356838.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/gijenep.pdfIn PDF document text
    • https://menu2uplus.com/images/file/posigavegu.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/14639138273.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/57967779077.pdfIn PDF document text
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109070330552766.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210903_07C9CCB399D37325.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zumugun.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/56811287626.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/85894054576.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/donubidusarilikinadusizas.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/92882454221.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/jotegopifurobesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=watch+911+season+4+123moviesPDF link annotation
    • 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_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10553 10996 bytes
SHA-256: 04c59298a1780519218ebd39ffc49c9c77f3664614d1f9843d19d669b4f201cb
font_02_sfnt_off00011ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE5 19296 bytes
SHA-256: f8d3ece7f7d676dc8d8e6e7128d6d6e4ff2cbf78b46cd11a80460fbc71ac190e

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