Malicious PDF — malware analysis report

Static analysis result for SHA-256 927d2f0a9beb28e1…

MALICIOUS

PDF

91.4 KB Created: 2021-08-20 18:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e9fed406942ddb9df37c10b2f3589ff SHA-1: 840f34e642cefb67a6200f49a49177e2ccd2cd11 SHA-256: 927d2f0a9beb28e1ae1b5f33888879a1630a24bc578fd1f7289af610bb65dda7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://dancedynamicsla.com/clients/38740/File/deliwadonujojisagepofo.pdf In PDF document text
    • http://jncs.kr/page_data/file/20210713054250.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/84631684306.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6d23dea355af70b74dd2c4b855dbed76/mubegonufo.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/venipisokadit.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/8f5gb38o1u0e836ibmdlpkqafq/sowefigotijusijaraxusa.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/lazikegodejumik.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c68ae06784---pezufokiwoxinorirewaw.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/rujirasegarisenanotaxego.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/90cb6ea4aca1d0567c65552733f7b2c3/3284380482.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/kelupup.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/28959034833.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/gavomivixafel.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16116e82590afc---dijivasejuxitarumuxi.pdfIn PDF document text
    • http://amdind.com/userfiles/file/tonemuwa.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105310652093518.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/gexubelumozukapakupimat.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca1d26b0c8---86589157631.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160fd083635386---20957471278.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/27797542931.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b122975f4f---punuwikanabibozajonarudi.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/simudufalugupafazunoweni.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/litafigamozok.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/nfh5dkte0ar880j4e84o97r9h6/33975218838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=a+christmas+carol+play+script+shortPDF 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_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 10496 bytes
SHA-256: b15bfb6dad4b109334f54a36cec4f18dffbb3a88b11a46f5077e7377f4fc0e4b
font_02_sfnt_off00013065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13065 17768 bytes
SHA-256: abce90d36fe675b7e88e2b7f14ba6c77f75f489e7afe2ddeb536a55214f561ae

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