Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8da8b080e9f2b8b…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 23:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d6eafa70a51e33ad75a282ff3c31e3fc SHA-1: 4fa9f1b05f20de3856067ebf8de60b41d82d3ffd SHA-256: b8da8b080e9f2b8b082543d2f91bb9307b20ab27ec1a5cd9d16843405aacf4bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the document is part of a link farm pointing to compromised websites, likely designed to host or redirect to malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613000d3d5118---basenurof.pdf In PDF document text
    • http://fizjoactiv.eu/Upload/file/13721771981.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c76905ea7ce169a512e92bd280dd2687/raladavotarora.pdfIn PDF document text
    • http://dyneco.kr/userData/board/file/72231871403.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/207c7ada0c254ee8b032de9dc540cae3/setibawazilitidolu.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/6717143070.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210919_CCADABC17A5FBF0F.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/zidapixe.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/jagineruzufapupagozinamod.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/2742310082.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/64935888759.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/4109784664.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/mulixipe.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/2474969980.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/pepibofolakivexipofajux.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/38498234941.pdfIn PDF document text
    • http://bojovesporty.cz/userfiles/file/60862335874.pdfIn PDF document text
    • https://bem-sa.com/img/file/98180638543.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/rmu808junft74v5ovrrv66t8i5/1873434226.pdfIn PDF document text
    • https://wittnebel.dk/file/96053815980.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/9082193935.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/12542431661.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/53154314427.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/28588424114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tamil+mobile+movies+free+download+websitesPDF 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_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 10772 bytes
SHA-256: 065274051ac43a2877fae328e7d08d8f036ee9759cbc259b8bd6dbcf2e944ed8
font_01_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 17792 bytes
SHA-256: 084172ac51f37c5de07d2427c04f755557791bf159ed9b56fb9dde63ec0a87f7
font_02_sfnt_off000131d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1