Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dee71a1834a844e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 20:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 085e9b4f072df3ca35f559d500fd850e SHA-1: 2158a50fed4d8fef613fb57152e89480647b43dd SHA-256: 1dee71a1834a844e41977c02b2b6a925862e1f8a3550f64092221e199b139f33
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to various external URLs, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=fake+credit+card+details+usa PDF link annotation
    • https://aakritidigitals.com/userfiles/files/vobusuwuvo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/7c82715d1983ea174981deb941f5314a/47494097899.pdfIn PDF document text
    • http://renknh.com/ckupload/files/28400493749.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300a92168fb---80757257071.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091521482914.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/96596249252.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/wunabar.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/82005933269.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366c11f2fe8---19965673767.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/nobutewujarogowabevoz.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/5091980294.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/21094455200.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/tagabenomulozaxek.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/61681705293.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/bijudapozekemogegenoxigos.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210907063058.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4eb83825078ea5faf1fa416d4d4b00e7/lutudozirapaw.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/11499916402.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/vidosopelozavifumonupozu.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/64855824236.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5f8053765d6c1ef9e6e97c48605371aa/wevudas.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/xoweveko.pdfIn PDF document text
    • http://kccmaul.com/files/files/lulebora.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wifevalepikodatiriponif.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a184eadfb---95640718675.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_off0000d884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF096 18500 bytes
SHA-256: d958a93a806bbe074bc9453c85e672059173f6fb7531f7097e04321437c0a2c0
font_02_sfnt_off000120c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 10308 bytes
SHA-256: 4373cde627658388b380908dff40fa997f578b81168edf4ee272dcef87205153

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