Malicious PDF — malware analysis report

Static analysis result for SHA-256 e152fee89908eec2…

MALICIOUS

PDF

73.1 KB Created: 2021-10-03 00:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e57f9067fc3c4a299b9b8bea3f489513 SHA-1: b417ef88600d61c40e6ca08a5afb5ed33656cf44 SHA-256: e152fee89908eec2f29a853fb087ee504969e9b27b711390cb0b90bc385a7595
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. It also features a link farm with numerous URLs pointing to compromised websites and disposable hosting, indicating an attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • 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://crysiq.ru/uplcv?utm_term=never+be+afraid+to+raise+your+voice+for+honesty+and+truth+and+compassion+against+injustice+and+lying+and+greed PDF link annotation
    • http://ville-dammarie.com/ckfinder/userfiles/files/59118088259.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/91831929439.pdfIn PDF document text
    • http://dejonghenico.be/sites/default/files/file/begukosuloniwisotasu.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/93309805426.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/96644603323.pdfIn PDF document text
    • http://kcpsystem.com/userData/board/file/24267894552.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b53315eaf---11884863765.pdfIn PDF document text
    • http://yjccnc.com/upload/files/87931620107.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161489720e3ca4---sogenitemebav.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/66793049447.pdfIn PDF document text
    • http://infracsap.hu/files/file/63517909623.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/dorenagadixajajusila.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/sepujujemafuseke.pdfIn PDF document text
    • https://menu2uplus.com/images/file/20512261010.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/37304471646.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/84897609426.pdfIn PDF document text
    • http://vo23.ru/upload/file/moruxukujoxogeragugefek.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/xojopegule.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/lazoxezen.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/89816960164.pdfIn PDF document text
    • https://anapobolivia.org/userfiles/file/70208448531.pdfIn PDF document text
    • http://turnyras.lt/Files/file/37141680035.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/fepod.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b488b3b7f---xupibuguwiref.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/lezeje.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/maboridinixemotefo.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/91323155901.pdfIn PDF document text
    • http://adveotec.com/img/file/vamolikisuto.pdfIn PDF document text
    • 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_off0000b83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB83E 15280 bytes
SHA-256: 202f1c08c6fdae5665e716de3e7c8ea0dc53b05cc88fd6b67e6d2c1770a80d17
font_01_sfnt_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 11596 bytes
SHA-256: febd8d4488af82c3d199206557fc413ccae7890ec8f3fb89a0909684e25a6089

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