Malicious PDF — malware analysis report

Static analysis result for SHA-256 8457ba977c610ac2…

MALICIOUS

PDF

96.8 KB Created: 2021-09-18 06:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aafffc86a4152ff1bb2f87f95a5b8c49 SHA-1: d271100fcb71122cdd975a123c489a0c55b47278 SHA-256: 8457ba977c610ac27772a2482ad2ec255f58c4f32e2f9de637229d5d36ec259d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct, potentially disposable hosts, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://elhammagazine.com/ckfinder/userfiles/files/sefobatuda.pdf In PDF document text
    • http://barudan.hk/UploadFile/file/20210914171601545.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/buvuxabasazenuv.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/tupuxaxan.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1614555bdd79bf---pidudeborunafupolawomolid.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/gotefopemofaroxepukobapad.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa935a680e---luxuvibozubegug.pdfIn PDF document text
    • http://midospa.com/upload/files/visizas.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/bapekovafewuxubuja.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72468599047.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/12344390513.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210905084510193.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/gelepigaro.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/74605238856.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/9081872575.pdfIn PDF document text
    • http://msiutilities.biz/documents/bixilutojelatilulokufa.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a3ac4cf47ac7f68df90bb1a587bcbda0/24333590163.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/27499854258.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/sulapomofugojomixezixeb.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/85667332718.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/vanukivof.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/48749123961.pdfIn PDF document text
    • https://magerp.org/upload/files/31396802385.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/53204058855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mean+adjectives+that+start+with+ePDF 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_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 17536 bytes
SHA-256: 1a8e3f77bf8bfc4ee13f17c864c1bd0a8812c116dac81abb3f89dcb6f084f111
font_01_sfnt_off00014561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14561 10576 bytes
SHA-256: 052697c81b98020406bf034b9167eab28e043a4a57fbcc9efc4ea9d58c060dd0
font_02_sfnt_off00015d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.