Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadcb434d37ce852…

MALICIOUS

PDF

85.3 KB Created: 2021-09-15 21:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56115cdff9689fb73b62b34ed032bf69 SHA-1: 8de10e44e900370e02b7ebd39f82f599470641c1 SHA-256: fadcb434d37ce8526fd1663650c9867a4e328755d6e2bde671e7975ea1d34a19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a significant number of external URIs, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=optimum+online+android+app PDF link annotation
    • http://juncheng.tw/upload/files/zudusibovozaratovigek.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/liretusajaragixumobewoden.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/19174686020.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/68965746066.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/suvonekisuka.pdfIn PDF document text
    • http://spiregene.com/image/files/20210904_223706.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4d5d6d6c---48692018924.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/74866310544.pdfIn PDF document text
    • http://soyana.de/js/ckfinder/userfiles/files/13364610297.pdfIn PDF document text
    • https://badrivishal.com/media/dadujemevov.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/62539280643.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/gomirusovo.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/54488391363.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/29460497699.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379ec631d5f---92119291249.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/71718448094.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/kebuta.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161410e02b0596---93663016229.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3867b389f1d9c9660bd1ac4707cea2d2/vumusunevaw.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/83384575762.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/23582889137.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/rakovazuvunoxojozopa.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/futavisufisexalibit.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/larus.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/zatamaximiniz.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/78320923045.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_off0000e901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10113 18056 bytes
SHA-256: 1d8512d7c0ad7fad5207c28e13c04c8b1cac5113eb39a16550857036eebfa62d
font_02_sfnt_off00012ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF5 10508 bytes
SHA-256: 0ee019403a0ea8e5888e6f2aebb1ee40254c7227e8eff55a12391bb1d3f5402c

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