Malicious PDF — malware analysis report

Static analysis result for SHA-256 3015542d7df0591d…

MALICIOUS

PDF

87.8 KB Created: 2021-09-13 02:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62a9a3272dde084bba02e81f7892993b SHA-1: 020897f0eccfa8067f050ae2fce3e9a40394fd4d SHA-256: 3015542d7df0591dca5703432a0b30dd4310381862d2f0e99190466b571abf40
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads, forming a link farm. This structure is indicative of a phishing or malware distribution attempt, likely using the embedded JavaScript to facilitate redirection or exploit vulnerabilities. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://giteduguedesboires.fr/userfiles/file/zimot.pdf In PDF document text
    • http://zoekidsworld.com/userfiles/file/89146128600.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f45ef099e---zobujenika.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/35727170662.pdfIn PDF document text
    • https://flomogroup.com/upload/files/wusuzasutadef.pdfIn PDF document text
    • http://kuryakyn.ru/userfiles/file/fixaxizabawajul.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/fetolonukutotobil.pdfIn PDF document text
    • http://thepnguyentran.vn/media/ftp/file/64682096307.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/71257748779.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16131b381253d4---duvaba.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/daxonawamuliboxubixipoku.pdfIn PDF document text
    • http://www.siposferenc.hu/html/98619478440.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210903140105_npdxbu.pdfIn PDF document text
    • https://kapefashion.com/files/files/16498039339.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/jusewalawedipilug.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/43467894260.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/16053876473.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/wamepefunuvegozamate.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/tikenukimuzudesidariwako.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109061131037047.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/87711068570.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/pijotukebogosizimidi.pdfIn PDF document text
    • http://standardamulet.com/files/files/fezatujamixudeloxuvidopet.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5097b09a9---52146386397.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ad27c46397f6ee019e26501f6b538af2/rotubuzu.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/72032663950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+minecraft+for+free+android+2021PDF 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_off0000f2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D2 17372 bytes
SHA-256: 217cac4a1786876cc9adca16ea69d4ae7fe50e787c543917f677f9611ed10e8a
font_01_sfnt_off00011ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF8 10976 bytes
SHA-256: 3bb766d888f5b79319e76ad4fe09bf1d9ddf5d1288aef985946ce76e37560a7f
font_02_sfnt_off0001395b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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