Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f432f1ba19019d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-23 02:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d39923bfa02c02e2495029e7d44fe80 SHA-1: 5e8ceed48c0ab7cfa9c9edc735384d21689b2865 SHA-256: 85f432f1ba19019d78d43de8be02ea38038b1bac8a244656f37bc8a93b4cf57e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malware or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=clash+of+clans+hack+null+apk
    • http://falerisztika.hu/tmp/75525280517.pdf
    • https://mytekas.com/UserFiles/file/31213096349.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384d8167511---topedapokitizitizumedu.pdf
    • http://cedule-plachty.cz/files/file/ziborasef.pdf
    • http://rogersdesignhouse.com/uploads/files/25782867487.pdf
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/dajufovosidafuzukoxa.pdf
    • https://sitycare.com/FCK-UserFiles/files/rezorupimekotozo.pdf
    • http://taiwan-tsai.com/upload/files/30981084245.pdf
    • https://luxesystem.site/js/ckfinder/userfiles/files/vusafegapixugup.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141caf1ef86c---vuvobazipozubej.pdf
    • http://salt17.com/userfiles/files/wifalazijuramaje.pdf
    • http://alacartedesign.de/userfiles/file/18041265464.pdf
    • http://polaryachtmanufactory.com/res/wysiwyg/file/wetamil.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c480109248---72044443724.pdf
    • http://okfilm.kr/userData/board/file/96149206962.pdf
    • http://jaluzipro.ru/public/userfiles/file/runemazutavodagowalo.pdf
    • http://llux.vn/uploads/files/vusonupizedujomidifese.pdf
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/xofotenagobavivonib.pdf
    • http://sxsasa.org/images_fck/file/1630643110.pdf
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/suzamagileteguv.pdf
    • http://massarentearchitettura.com/userfiles/files/61316695362.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a6c1ba6ee---1935739773.pdf
    • http://joyandwowbook.com/upload/file/gominunonabogutas.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE1 16792 bytes
font_01_sfnt_off0000e5f8.bin
8b0658bf62588fd2f714ecfdfa324c92a9ec50f311b783e5d77cea92e2f9c968		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F8 10380 bytes
font_02_sfnt_off0000fd6b.bin
2f66532150e44ffddaf049736fe3bae95101e477981cc9c7203cf7f258cacf1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 17984 bytes

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