Malicious PDF — malware analysis report

Static analysis result for SHA-256 03810a0ed33a2f41…

MALICIOUS

PDF

80.3 KB Created: 2021-10-06 01:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cd22bbc8efe440fc9e4ce1d29974b625 SHA-1: 89f95e7eaf5b1038761c62365b1b3bb2842c6be0 SHA-256: 03810a0ed33a2f419710ccab0dc3296a3eb4aa4a8433fcdf8d0991f6f93f24cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/79367176144.pdf In PDF document text
    • http://struttur-arch.it/userfiles/files/52514894278.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/bekezini.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/27114565841.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/72085880202.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/waturomiwigefejigubuxegi.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/luviwalabakimili.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/tidizemugixog.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/59115829588.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/32350281263.pdfIn PDF document text
    • http://infracsap.hu/files/file/4502205571.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/c65a6af66e79c3b47f5f94af36c7ee17/20061311552.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/gamijimelijaxudevuz.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/lolekeneven.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135c911da14a---76749692581.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/xumer.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/16129884633.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/36674953294.pdfIn PDF document text
    • http://webhoctot.com/app/webroot/uploads/files/lexarebilazunixuki.pdfIn PDF document text
    • https://maria-galland.ru/files/file/11422598468.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161303e6b775d7---38391135115.pdfIn PDF document text
    • http://ttc-investco.com/img/files/46177449694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+know+fertile+daysPDF 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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 10628 bytes
SHA-256: 8f4af3adc5ff1825b5af07849e88b8c9bb9455e2bd94b01fa51b1c5de6c73950
font_01_sfnt_off0000eefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFB 17472 bytes
SHA-256: 1e6ca90fadd610ee8383bd45484b1d53181272c2d8431baa3c3636dde385f911
font_02_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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