Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d1ff5acd51f91b…

MALICIOUS

PDF

86.5 KB Created: 2021-08-20 02:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f822c9866a391e474a6b33d2025ad98a SHA-1: 0801d6d6dfc875bf132c823a5456cd87bffd71e1 SHA-256: 09d1ff5acd51f91b59393cf753f91345a0f486ee4e8f1302f9bb289b705ffa07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, some of which appear to be compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://wastran.ru/uplcv?utm_term=ejercicios+de+ortografia+pdf+para+secundaria PDF link annotation
    • http://autohondl.cz/userfiles/file/23844294688.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f7aba33a141---xubevivenogamemenunob.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/vipow.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c4d75544---81140411454.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/32737039657.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/vafuro.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/lidezunuraxonominof.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/14758399664.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/falebifijalalanudaxog.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dfe15a810---gatonozasesoxe.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/fuvan.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/nibatejetebewirawi.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/36715337747.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/bafaguzidokivu.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ace90c123fd---42369138490.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ec8b7a55---tovimutoxaputil.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/muluzila.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/zuxamiduletugubolofagozuv.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/26812808331.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/wojuve.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/kogonodete.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2108200709209865390x2gfy.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2783e8c2---95889709967.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750b616e77e---40883432780.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_02_sfnt_off0001034c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034C 18492 bytes
SHA-256: 4216d3dacb0c1cd2692d73a97837c61c14005294b6ba120c57c99c77179384a0
font_03_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 10964 bytes
SHA-256: 2e926c77bfd9925edef6a1c3e3468e561fc3953b33b1cc3aa91a87d079267a87

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