Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b37036f23f9ddbe…

MALICIOUS

PDF

112.4 KB Created: 2021-07-10 09:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c8c6855a11abb24bdb7c6abf7d2523e4 SHA-1: ef5e838130c521625919ad08401748346859819a SHA-256: 4b37036f23f9ddbe0619d0b545981d6a309a75f16e7b3612940fcd8063e0f40f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9718

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 https://coonvalleycc.com/userfiles/file/21128637907.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/79v0iekf77ljasg5tmb3t25710/rewidiki.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bea5b35a043---7578318832.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608af0bfefbb1---56190575972.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16090b72f98159---zugukoxaniriwojoxij.pdfIn PDF document text
    • https://avenue102.com/uploads/file/xuwafisevufovom.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb4876dbbe---82765733333.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2871d40fe1---jodibog.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4baae598b---42564114222.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/24603621422.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/kagixoj.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/32916312279.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d7e51425b243e35fb8f73e2ea07c3149/wuxigezivegomavitupef.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aec1146123f---42416740467.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/xibofuzegijarebavi.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc9cb79f55---10948380970.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/kmemn1bipvpb37rf00ajjh0le1/kujujap.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949a2f6ea8b---82876062046.pdfIn PDF document text
    • http://emprenderem.cl/files/lopujosataredikefaxis.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094a99e82928---60255652677.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/6dbaca21e6306d7a4b78bdaa96500452/50467433531.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/sudusesapu.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/2957628102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=state+and+prove+green%27s+theorem+in+physicsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12864 21672 bytes
SHA-256: 3ec0637e8f1dc0911098088ec54a89e41826b2649741130912b4333c92501dd5
font_01_sfnt_off0001632a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1632A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B41 11204 bytes
SHA-256: c698a9f3f6ab8de0b9c0c5098772575e08da1391fdd4aa0d1349f756cccc9eec
font_03_sfnt_off00019529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19529 16228 bytes
SHA-256: 6de2e4de3e01fd5ed443d1209e1dacf3a9d2e38faa1ffa722a59a0423b67245f
font_04_sfnt_off0001aafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAFA 1696 bytes
SHA-256: 28c5bcedffb0f63c0f18ed07264126f7c833899b916de9a351f9850be7cb6bae

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