Malicious PDF — malware analysis report

Static analysis result for SHA-256 9948949a49d69e1e…

MALICIOUS

PDF

72.0 KB Created: 2021-09-29 11:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f94db1f1704e3f3574c4eb8d31e688c1 SHA-1: 48fc7d8169ba84a0237f783c5c8d3bdb98a6d77a SHA-256: 9948949a49d69e1e0da9c4d41beeca9864aa6ae1c001f9c0bbabc08fec7a1280
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and multiple URLs, some of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/zagunokavoti.pdf In PDF document text
    • http://kcpsystem.com/userData/board/file/91010771337.pdfIn PDF document text
    • https://guenangequitation.fr/www/site/js/ckfinder/userfiles/files/87808940958.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210906115157.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/zupifonibobelenomazetubi.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/garexured.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/b7e5a11fe9bb1d46737b9dfd138b57a4/27192550191.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/7065444127.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/fonulakega.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/sezutiwironaregu.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/sazes.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/zidegofusasuxepukupumivuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355cf04a985---ximix.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/87830493861.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/63512783781.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/pumumabapebew.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/topapuvipugusug.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/bajojogisiguxu.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/fitiwawiwukedojujuretip.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/faleludegafugap.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161410eb6c8b01---wanuwodegalevuxofozed.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/xinamedaz.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/makaw.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4af447fdc---18864015.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/28619894275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=action+jackson+full+movie+hd+1080pPDF 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_off0000b555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB555 16348 bytes
SHA-256: 90d2b8bb732ff28f1514869eecc9331dfa55283fe349fd203be18afaa89f0b98
font_01_sfnt_off0000dee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE1 11536 bytes
SHA-256: 6c52e6dda50382cc9a0f60d89d4b6457641184ca85cb6dc603da131fa4f6f37e
font_02_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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