Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1d8eb76ed224037…

MALICIOUS

PDF

77.7 KB Created: 2021-09-23 20:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75df2125c399a1703a92162de9395b3e SHA-1: b4bc25d29f6fd8262a297da94155d09cbb77c6bf SHA-256: e1d8eb76ed2240378b805c8a8cf08942ebfabf5f03e10da077f1634cf4b15b9e
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the delivery of a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nomylo.ru/uplcv?utm_term=pdf+for+printing PDF link annotation
    • https://0286869143.com/editor_images/files/32819630155.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/kebewow.pdfIn PDF document text
    • https://seikai.jp/free_images/files/fetolimawobol.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/97509130710.pdfIn PDF document text
    • http://ausafe.net/images/art/files/71784055288.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/29427815547.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/pejojikukumojunalabep.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/dizagumiminepeve.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/75464220758.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/ginugomalod.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac09ce36ca---9138058006.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614baa0d5e81e---rewopukonosaf.pdfIn PDF document text
    • http://gibisch.info/files/files/tuzapokalav.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/74032884318.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/fevakopeb.pdfIn PDF document text
    • http://dmkert.hu/files/file/53050852398.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/nogizaniwetunib.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/7205088234.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db20893400---bogefoxizogavatituxewezi.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/jamewezuridikupa.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/gokepozedadosokesu.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_off0000d07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07F 16496 bytes
SHA-256: a2c55133c5ca23f4a1ecf13f0c9ca0716e0c67abb4d56fdd0ab4cbae1316cbc7
font_01_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 10168 bytes
SHA-256: 85adef39cec93ced2b04a12a25dec99e18552b5a7ea43a4dd6268f1cb3577023