Malicious PDF — malware analysis report

Static analysis result for SHA-256 523d7d3471cf1845…

MALICIOUS

PDF

83.6 KB Created: 2021-10-10 13:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 928c460ffeec7ac64145a6d5e6b0a94a SHA-1: 550de305e1281a004f170dd270041cee6ec6b84b SHA-256: 523d7d3471cf18459598606ce0b4796d3730ca5b9095eb6c6ffe87a5f232f75d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or conduct phishing. The presence of external URIs and link farms indicates an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=national+guard+acquisition+manual PDF link annotation
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615ec50a71158---rotimes.pdfIn PDF document text
    • http://strahyi.ru/images/file/75829698195.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/8230835479.pdfIn PDF document text
    • https://equinox-e.com/upload/files/82223420108.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/gegiwobi.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/nunejuwebebu.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/fiziwopixikitat.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20211001/file/wobibi.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/1400406023.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/c547b2f731f3b9c1e2deaef3c718a5b7/kirumulaxibubozuf.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614c705f98a11---pavaben.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45a3be6ae19bb754aad00641de8041e2/movedexabokepakarawet.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/90352684979.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/64349115783.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/kovonukolowiguwowotig.pdfIn PDF document text
    • https://southafricapools.com/contents/files/60856741999.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/60543761923.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/xupebixuzazisizo.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/2456558549.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/wiwitadizopiwuburavodu.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/8206306550.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/98963174212.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_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 10804 bytes
SHA-256: 3c76d64273f9b0b21fa2c269562fb951513016d4606a91d1a0a03468875f86bd
font_01_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 17964 bytes
SHA-256: 0c76c7adc6b18e26c43864531bd21226f16ef3e46480ec571858b648c72ba47c