Malicious PDF — malware analysis report

Static analysis result for SHA-256 06152ff8a86e7a08…

MALICIOUS

PDF

98.2 KB Created: 2021-09-02 04:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f7ac4f8ddf8530fee4483fa72b3699fd SHA-1: c4a90a0659d9678c41cfef788396d541136effa0 SHA-256: 06152ff8a86e7a08766ba3f9357e7eba2bb23b661282a148ffb13dd8b79fa691
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to external sites and appear to be part of a link farm. Several heuristics indicate that these links are hosted on potentially compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://zemiigori.com/uploads/file/ximomiva.pdf In PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78674996581.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/32963902053.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/fojaxiludediterija.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/88274713834.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/afbd927e26d7a1144eca14708df1f1db/fupudolidarebav.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/56934485645.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/16855500792.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/fasufefigitadonalaje.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/43891868429.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/kapidiju.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/dp7v8a0jo8d257qvkv58r4sjl4/wurasaxuxa.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/fobero.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/82246475848.pdfIn PDF document text
    • https://faprosid.com/file/fapemofu.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/s89cong7ebeuiq94ol4f9eh25k/ralefefijatoxukug.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ecf070009---kuwipi.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/ditemuwamawatolas.pdfIn PDF document text
    • http://camonetinternational.com/files/file/48329582994.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/nawanigewuvoxit.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d76e6aec65827795b8c6efab40bc02e5/zutarefadiwunamonat.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd601e5747---2112448175.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a27447f83---gabugusitowezeletizafi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d55e135630---selewowakegepetivod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+haunting+at+bly+manorPDF 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_off00011875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11875 18960 bytes
SHA-256: c1d33eba56c1d2e75447e824915913328d10cba0dc8a69b7b26550f75a17f85f
font_01_sfnt_off000149de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DE 10704 bytes
SHA-256: 49429e35d99344445ac587d4c4c2948a75599bf86a6aea8159856c18aa92bd8b
font_02_sfnt_off00016230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16230 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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