Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e53344fdfce3a40…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 08:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2c286448605ead8e9b9e1f40def48fe4 SHA-1: 696533c73416bd50dffd12a9977884c32889a51c SHA-256: 9e53344fdfce3a40bed41aef4f65884fc7230c0406cf391c97b9cf8c8d55caa4
156 Risk Score

Malware Insights

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

The PDF contains a significant number of links pointing to various domains, many of which are flagged as potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the final malicious destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://naturestuff.nl/siteimages/file/46608143550.pdf In PDF document text
    • http://dambi.pl/userfiles/file/99974700712.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/igbaj99cjnr1cb6tp7fe8df3k5/44944868038.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/74187024890.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614358b0b5ff8---dazusup.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/50708804115.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/tevuzow.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/latijukita.pdfIn PDF document text
    • http://rts-3.ru/upload/files/numerivolunogeta.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/64196465760.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fcu7b274aqtiuec643ur7ge6n9/bisumalodiritowilozorup.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/15157336580.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/jitoj.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/vaziwawot.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/23526272815.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135b010253c8---wuwitoduxak.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/wexifa.pdfIn PDF document text
    • http://runo34.ru/attachments/file/libav.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/mugonutemiji.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/96765121271.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d246895d94---47445866528.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/laxanazet.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/sizelivafesoxowunokeperi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=torque+pro+android+auto+2021PDF 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_off0000c799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC799 16892 bytes
SHA-256: ebfdc44188324be6ea30f7977badd2004acc8e30d3fc897f4e328690d59e4e1e
font_01_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 10672 bytes
SHA-256: 0f1aee49e07531a6324147e16b971382f9ca8ab3fcc725cee664a5d91d21c893
font_02_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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