Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbffed67501c067…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 17:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b84ac8f5c22a45c312fde679829bd051 SHA-1: 77a0fdfde5cfc7a42262e8c68a35174713321fbd SHA-256: dcbffed67501c0671e10d459d07c986e8d85bd145d16ae1fcefde726cefb6063
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, with several heuristics indicating it functions as a link farm. Specifically, it points to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://protrialse.eu/files/files/35966811203.pdf In PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/zawerodosopu.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/mutusegedipafiw.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/11783151000.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/wibivezomuriviwanebev.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/sekezus.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/zetufikamumefamirej.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/65131951849.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/fizotire.pdfIn PDF document text
    • https://orrizon.ru/images/file/gidezokawesowawa.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/zikuxu.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/70357187388.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a818fdda46---lebexalevegusuginane.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/zixaw.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/0036d8e53fbeddac1309ed95a9c7e61f/50766211350.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161376f1f404bc---xewoxulokeforadu.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/25620384966.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/rasusewuvebodida.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/dumilukev.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/78802646529.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/fagivusuza.pdfIn PDF document text
    • https://agrando.cz/files/file/badedolipefu.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/korupizevimuras.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/36552471506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+to+find+updates+for+apps+on+androidPDF 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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 18080 bytes
SHA-256: 1b2ab9b3510ffd59e78a5238d4db8d90a94df6128f325553838b0f725cde73c1
font_02_sfnt_off0001254c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254C 10624 bytes
SHA-256: 2206776b4d61c1ee59f169042305ba64053e51c68f5df44996abbcb23089b636

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