Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e2c557a0de76d0a…

MALICIOUS

PDF

72.0 KB Created: 2021-08-17 09:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 81c98a8a6fc13c0d32989a0d7f6b37a9 SHA-1: 3ff41877c97f378019c3af58209917410cb96f1e SHA-256: 1e2c557a0de76d0af216cf38675779ed7469b5649b12f0ac6894a90a4da2bcc5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs that point to a variety of websites. Several heuristics indicate these URLs are part of a link farm, with some hosted on compromised CMS uploads and disposable domains. The ML classifier also flagged this PDF as malicious, suggesting it's part of a malicious campaign, likely for SEO spam or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6658

Heuristics 4

  • 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
  • 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://queure.ru/uplcv?utm_term=how+to+repair+bose+wave+radio PDF link annotation
    • https://traffictkt.com/viking1/uploads/files/41045491004.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/74655969431.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/rojirebefurowom.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/45210326198.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/nejisezukemu.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/39367975495.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f371b62020---65315750706.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/jogivifizekexidete.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9594e32664---kosinajemupadutomogojiwux.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/vdv7ps8kmkrog5l1bajuqnsu02/46030225214.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903b052aad8---62770989317.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c692020a87d---jimoxiximukolir.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ff03edbc6---35646374305.pdfIn PDF document text
    • https://melz-feu.ru/upload/noremixawizume.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/jakizavemato.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/newutajefojubugidulopof.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/ca36248a35b7cbf7f6635bec18315052/75452625129.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/3d657kf5g6vf9omk87grdd3u9g/45445891565.pdfIn PDF document text
    • https://lecachet.fr/docs/files/28791762174.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/darezotiw.pdfIn PDF document text
    • http://fnb-concepts.com/images/uploads/files/fitawiwuwa.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/8732791121.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/89485457088.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB21 10516 bytes
SHA-256: 6a8be5c63d95b7e5efe656b0c5926ca05f08cbb2d19b3e5fff18002957f9924e
font_01_sfnt_off0000f2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 16668 bytes
SHA-256: 71d3f7cc12d58441a447d3be665056addbd4384f9125f7e1708a69b779411b5d

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