Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cddb923875403f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 15:19:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 684e4e91cf4d92e5dadc3e5809819fb6 SHA-1: 9b0522c71ba0b088ed53c3cf5ddd85094b76c5a2 SHA-256: 89cddb923875403f695a8a341c1b76daf28225ffd5166d5d2237232da9fe1801
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed for SEO manipulation or to serve malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607da60fd85b6---85550265097.pdf In PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/32313043860.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/9565054648.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/81157667069.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/javimagabukozoveza.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/71243351715.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/bakosetesarujuzefajo.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/82423674319.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/7be838ea609365d2363dea266f5d8c0a/melolaluwivovozumilarurom.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e41c80bbf---66013628567.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/mewetekalogariw.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/junipuvisiluniweriwakorev.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/n7hgd1m8dtfoq8ucm8u1h4u0c3/mujaneluwoge.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/76111653676.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1bc69a057b57651fd21f80f3ed19fc9a/durasevufozolaxeranolif.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/vizoduzirunow.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/72215100083.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/45259939280.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607510603d633---50345077130.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fab50fe0c---setojak.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/86dab732b5289fc7b3b9439d15f17a13/75346989401.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4906af07798227c15d97286938754db6/savaganosapadidexew.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/93310745521.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/21923ca54ae40ae81979ce68138912a4/lepufo.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/detevijom.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/totapu.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/lefaxelunamefezon.pdfIn PDF document text
    • https://mfdesign.hu/files/file/noropefodejoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=excel+search+multiple+worksheets+for+a+valuePDF 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_off0000d097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD097 18024 bytes
SHA-256: c86855a5554efc999989774191f95270a283ecffb76b0b26cfbafd77d1c0462f
font_01_sfnt_off0000ffbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBB 11068 bytes
SHA-256: 244f30b59a23b32b4493cc1e2ceaac3d423cb2c424c52162751be3867efd0e4e
font_02_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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