Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec50fd39ae560a0…

MALICIOUS

PDF

99.0 KB Created: 2021-06-10 05:13:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7c0c2b8d15a2787c683893843754becc SHA-1: 29884bbcb86e748a4df16d49303a33d6db4dcd92 SHA-256: 6ec50fd39ae560a00f74d832740ac6bcef5304d67f7b02ff233415e40a3bae8c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to compromised websites, suggesting a link farm or phishing attempt. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a malicious payload. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=tabeer+ur+roya+book+pdf+download PDF link annotation
    • http://yossy.biz/userfiles/file/kuredoturu.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90fc4667de---40154490356.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/jivafi.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/2342367517759fc986c843437980e79b/purasawoxamaresonikasimer.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160761b8e20aa7---zitapapadirugege.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/wagixixofudojuzabuf.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/gemefusukigog.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/gvelrlovrgvb8b5m9sv9lgf546/73284803940.pdfIn PDF document text
    • https://asiabiru.com/contents//files/gisuviwizuzusefolu.pdfIn PDF document text
    • http://groupkaishan.com/d/files/sozebapoxowiwisosowute.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/516b68474647aa10f99cb00882481771/61717439207.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7867e421---33407105106.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160965e8a29e8a---65181144849.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160963741214e3---71526813723.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/21363887573.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b700be6d7dc---maxurujinupod.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/35807336356.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AB 4956 bytes
SHA-256: f90ae68acc30a3a7f75b562e503da24a9cc33621fce4424cd64246e1eebeac25
font_01_sfnt_off000123a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A9 11796 bytes
SHA-256: b788f4253c5ea627de20b965e15b9fcf0b329aa2a3d64abe2e39cc0757bb9215
font_02_sfnt_off00014b56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B56 21988 bytes
SHA-256: 3db1ce4d73729eb838d83efec5f777a0b0159f3f12415e2874525d8c321c635f
font_03_sfnt_off000170b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B8 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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