Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e6e0534e33e1ee…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 18:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4a74d15f13718e51df4f8a7a2789130 SHA-1: efe45d9c5c32e3db026c8c43c52344bfa463be95 SHA-256: e8e6e0534e33e1eefb14b4e58f66b8ece2dc35ea749883a0a95eb50c759e3e44
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+to+see+private+instagram+account+followers+without+following PDF link annotation
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8ef803ad24402f5c7b72e21aecac13f9/53344698969.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/65669878283.pdfIn PDF document text
    • https://hirurgija.me/files/janewe.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/wogatobiz.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c7575007a049530a3741622dc3194334/dajakeketomivaj.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/modumaradupuwu.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/6477143339.pdfIn PDF document text
    • https://epiphanych.com/images/file/kaxujulabixutimelazosibo.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/97927514393.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/vijimijik.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/32380202466.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1bdca39ce---wexigagivowa.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/madokikafowi.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/9805512354.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/xuzagix.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210911190455.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/87142200891.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/96397817093.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/laxupefugutiruzebipewez.pdfIn PDF document text
    • http://blccy.com/userfiles/files/13526989253.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/320dfa38d2a356b0c5a40e224555bf1a/zejalitevejizori.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c49acbd84db86caec2630f1206a3c86e/xizapab.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_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 18112 bytes
SHA-256: d223cf5f44aac4397515e7fabf277f748e7187f932fc224e04473c3c86acd8b8
font_01_sfnt_off000101bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 11168 bytes
SHA-256: 7e7c4b67c6bc7e4900fc752132842c33c810353c5dce8a9a615bd75fbf76af2a

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