Malicious PDF — malware analysis report

Static analysis result for SHA-256 21992f2ea6e2ed3f…

MALICIOUS

PDF

89.8 KB Created: 2021-07-09 01:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 350912e5d4882aa11396d17e94e9e327 SHA-1: c04b4051aa17b569ff4e84163f676a9e1f5634d7 SHA-256: 21992f2ea6e2ed3fba8acaa4c45b281996b2722ed26efa61570bf0487b0625c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=density+and+states+of+matter PDF link annotation
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608689304a77f---xapikolofaf.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/gvek2k7c661gami61vnnib0ddp/poson.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/8980217692.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160940b1055901---46689133334.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/pepirenewibebotefonenapu.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f732bc2c5---sutokigu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b47c68782c---gesufuzimegovabu.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/rifaniwofuseputagevek.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160820f0223b0e---fimupomepizari.pdfIn PDF document text
    • http://thedreams.cz/files/wesukedeborazabinulatem.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d55f49b72---52091513956.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/jeterimekibabelo.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/20024522621.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bb07a67f912---gigada.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c17d1721027---digekotipijusimegatoz.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/71530765020.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083750499a9b---15257120490.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/wivapowiw.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f8839b64e---29615182584.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/sisubumukivax.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4f94eafb9---lenuxuwefisop.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/9311949582.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5658e4e906b42a3135b0dd2ad949bb32/23231292356.pdfIn PDF document text
    • https://digireg.at/upload/jenuzugekanakibajobi.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1624492297.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_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 18224 bytes
SHA-256: 46e014b7a3af78943ecb76c457d77da104ecde710fb6487e74973948a1472b78
font_02_sfnt_off00014178.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14178 10584 bytes
SHA-256: 1625a29ac371510c0fedeacb0dc4e3d65aececbbb4183bf22cdbbad30fe3b433

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