Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c518a1cc71a19d8…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 11:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7eb308f45f2d4fb6e51ed21d13b9750 SHA-1: ed314da5d691130731824ac01499ef8994bd0566 SHA-256: 8c518a1cc71a19d8d43e22a5a3dcc17d722ed26186960406d34c477035c04122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit user trust by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4e07ab3a5dbcc22bd6fb4016b7f2e908/zabakaxufedevafezunuwep.pdf In PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/bobukifiz.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/e58e314i2vno9uemjlps86d6l0/64226779220.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/25107244615.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/tajagibufelawopetenu.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/teguluwo.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/zazunugalun.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///rumopajijebovudiraxin.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071d26491a07---56837525470.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080a95130ed7---xonexunaborukasugixew.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160afbbed09cca---48278605737.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/55595000324.pdfIn PDF document text
    • http://fkhd.cz/data/img/rigevi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160caa86f71a27---98805186138.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/fuvutixigemabo.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6hfoelf8rfvmig1oo84ttud5ga/wilanutepetariwow.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/nrojs4e99ng6g3atq443sh732t/11627467262.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/ripujidubaropesowop.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/44963995933.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/dcd86fqku2b1vunapsuk1rn96r/55025022496.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1eb0b1e72---18258710592.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/vozebirir.pdfIn PDF document text
    • https://icbacademy.com/upload/files/joxebakufidelava.pdfIn PDF document text
    • http://epplast.com/files/file/xofugux.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/97125474404.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/4755322526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=hermeneutica+introduccion+biblica+alice+e.+luce+pdfPDF 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_off0000d9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E0 17276 bytes
SHA-256: 3275c88dcde5cd0c1d4718f5ac3a6ba2771ab2f19af4f7d369151b1bcccccc8e
font_01_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 10908 bytes
SHA-256: 4323294a8bf921805dcca228bd536d4fb2fd8bad40e03f1e7919673e0bb4939c
font_02_sfnt_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.