Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fde00ec79f8b3de…

MALICIOUS

PDF

84.9 KB Created: 2021-09-06 01:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9dc5ef34bdf19570711b00e9f69e0e0a SHA-1: 364afa0ed35e849a66c1fb17471f4a5ca22ae845 SHA-256: 5fde00ec79f8b3deffc64e0e1619dfa85f69af518619962e652b1db9af5ebcaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. This suggests an attempt to direct users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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.mbk-montage.nl/ckfinder/userfiles/files/23693407655.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/be5f71f225469882d4b3fd532c49d655/fimezuzugigukeludepenizez.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1611930dc78211---wibododezijapoluwolubi.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/gigajurogapetubimakimod.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/9b6cd96b8ea05eb9bc321268561faf8d/daposexefafavoronoxi.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/24981536887.pdfIn PDF document text
    • http://placc.info/up_image/45445391470.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495ecec62c---7954830152.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ml1fthkbkc8uhcg2nevms5bjn2/mepef.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/fiwipov.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e54ab1de---30475374164.pdfIn PDF document text
    • https://servicepapik.ro/files/68726085190.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/38219023936.pdfIn PDF document text
    • https://unosms.us/userfiles/file/nonez.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/b4hnlku3riuvafcsdgj9j7a51o/63363553986.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/vifewodinarunovofeje.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/jotodezujepogalowez.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/iavappvrfrlrem55k5hi25uils/zimidivewuvalefiwoz.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cede6a3e73---gekinusipiwaredo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4ceba686---mexolaredetugixi.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/39327654002.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8cb758a8d---98935406537.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/13588815704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=grade+10+canadian+civics+textbook+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_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 11180 bytes
SHA-256: 2a672681dfe30f9b1b686c55db591488763bb81e69f15f8d8731e68e2ff6da56
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 18168 bytes
SHA-256: 7d939982fd55ed88d9e72ea24966ccaf7fba0fad5d18d833715065e7b4931584
font_02_sfnt_off00012d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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