Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3c8a132b178636…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 13:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7aea4796bafcbdebd0d3e99689e3767 SHA-1: 4ad12e35ad7b3587f869c2822be8fb16bcad6f15 SHA-256: 5f3c8a132b1786367f9228db91f8e640a2a5049d0838c3097e655462c5e3482c
144 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by ML classifiers as malicious. Heuristics indicate it's a link farm and a social engineering attack designed to trick users into running commands, consistent with ClickFix attacks. The embedded JavaScript likely downloads and executes a second-stage payload from one of the numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://piataafacerilor.ro/app/webroot/files/userfiles/files/57310927011.pdf In PDF document text
    • http://gostinica-domodedovo.ru/files/17121571936.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/77988879195.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/58268171413.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/11057794002.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/zodedejepugaraduge.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/tivutadotonakulu.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/tolanetegi.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/losavezise.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/nepuwefukusekipija.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137bdfbefdb9---suganojokejilijor.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/22928311150.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/16238085024.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/31990940235.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/3295863720.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/vafokixegakajelegajipinod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310196a79f4---88363154450.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///55299297877.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/vazuvitovutezejipexixol.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210912_1851F112485463BA.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e1894ab6---9407976207.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/38278839751.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/rupeturodowevudop.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/79398af4607120d2729c060c37a420d4/woduwene.pdfIn PDF document text
    • http://jumpstart.mobi/userfiles/file/zutimasotukal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=moving+lock+screen+wallpaperPDF 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_off0000dcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 10688 bytes
SHA-256: 122056cd9344cfa8fd6620200450f0ab2e4c168d279d87861d133b30242c9b86
font_01_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 17516 bytes
SHA-256: af29d32622fbb0cfa89dd5572f3bb076800179613f96b7e11b009b47841ac126
font_02_sfnt_off0001231b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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