Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b050a2be9210c6…

MALICIOUS

PDF

87.9 KB Created: 2021-09-08 23:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32e123627e245aed235aecf3496e127d SHA-1: 6031639fe04db54331c098be4d9c7da9b3afcb7a SHA-256: f0b050a2be9210c6548aed98703295d0656d26ec2407883c855004a99239cf71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 https://archism.ru/uplcv?utm_term=mortal+kombat+legends+scorpion%27s+revenge+sequel PDF link annotation
    • https://baoyi-chuck.com/ckfinder/userfiles/files/46260113460.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/395033374.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/57680526357.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/bozexodosinosarote.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134100e760af---sibifiziki.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/1470832071.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/62849221522.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f7d74785---93799337097.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/d8bga2gkjdmh5ur1fpqb8fcipf/zulumovukojowiguda.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/17466507234.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/buxurokowaxasafezimofu.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/gigaloboku.pdfIn PDF document text
    • http://totoumi.jp/upload/file/paxodomasazaw.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/14c070d5dd12da58aadeafd63be4b49d/58269984159.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131080a5e186---13589626408.pdfIn PDF document text
    • http://underbutter.cz/download/foto/sikagijeroxo.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/85523640066.pdfIn PDF document text
    • http://letdentalab.com/img/files/zijaderiwutix.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/vegoxusajolanovuk.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302ebaa9e33---28284478037.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/gopiw.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/sawas.pdfIn PDF document text
    • 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_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 18660 bytes
SHA-256: e3d2c77d200e30fbaa4a40bb6f122661ccb981b21966a682143c7c69a9f4b1e8
font_01_sfnt_off00011f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4A 11428 bytes
SHA-256: a074fca51c83df17bd8a156d1091f8e454c25fe2283450fc9652d0dfa7da47b6
font_02_sfnt_off0001399d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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