Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab10b9eed21b150b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 17:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8405568cc288d71c1c38366e582f96b1 SHA-1: 120b2024819d27d927ac089d203bb6a253289944 SHA-256: ab10b9eed21b150b3fa29333a6c46603321da8c65ccf7b22f10b4142b104c616
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly indicates malicious intent. The presence of JavaScript and external links points towards an attempt to download and execute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://medvor.ru/uplcv?utm_term=screen+off+gestures PDF link annotation
    • http://burattinojatek.hu/userfiles/file/dowesopudokuxota.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/fewapefakib.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210902_164911.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/farimegodasozumuw.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336c8341242---27801142566.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/53336691552.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/teraligexenuda.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/wuzurapoxepexewakutoxade.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/28580093808.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/fiwafuwenijozax.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/66245768003.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/3788012961.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/5296531350.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/54461880149.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/32455637326.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/laxubigik.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/79974580963.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614105f633667---99049987321.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/31796562762.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/molaribuvoridasoze.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/28589674969.pdfIn PDF document text
    • https://congchung7.com/upload/file/99807918705.pdfIn PDF document text
    • http://dentherapia.hu/files/file/sadutelexolesafa.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/21134978835.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/nozubeziw.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c2d64f26---keridix.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_off0000c391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC391 17444 bytes
SHA-256: 5e7eebb1546ad337d85542aef42439dacc17a32bcad4755eec9eea606a10bbe5
font_01_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 10384 bytes
SHA-256: ccc1affbb8a057282f0670af01e5e22ce0c6d5d6765535e71dd13d4770eca74b
font_02_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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