Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60150deec6fa3ac…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 05:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fb365c048d92c8c026bb441e5332f338 SHA-1: 2912ac2caf6f511e0a89483d9d550df3abee124c SHA-256: c60150deec6fa3ac4b2842e4660171b319e3e8177b7456addb35d655b00172cb
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to compromised websites or disposable hosting. The embedded URLs, such as 'https://cructi.ru/uplcv?utm_term=intro+maker+mod+apk', are likely used to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=intro+maker+mod+apk PDF link annotation
    • https://jecoexports.com/ckfinder/userfiles/files/69393414206.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/texulibibobet.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/dufufozikedip.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/deluvuvufux.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/fegerekaxowikanib.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/nipozuxiveka.pdfIn PDF document text
    • http://konberdbio.com/upload/files/10003592690.pdfIn PDF document text
    • https://phunhai.net/upload/files/51819004015.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/teguvanuxafigojivos.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/49769898074.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a8ad9709179e06e2fe89d6c3f8117a56/46730330806.pdfIn PDF document text
    • http://chongros.com/userData/board/file/sexuvukukizamemupur.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/fajajovutitozibawujo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d2410db3---jejowexifidomuguvulob.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/818f07db9d1ccabe8b4eb37f52fd1134/86317035556.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/1714904045.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139dfb0cf789---87551489091.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/bikogapedosokaro.pdfIn PDF document text
    • http://klgd.spokoino.ru/i/upload/files/54220835416.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/lelubutubewulutebotavix.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/levegige.pdfIn PDF document text
    • https://aromamarketing.md/img/files/50032550937.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/mafegexajojokowavobip.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0359760fc---juxiliwufasadamobazus.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_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 16760 bytes
SHA-256: 6616888ac236ecce817017e19616e14708416a60a21814bb178fe4de4c5d2e49
font_02_sfnt_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 10288 bytes
SHA-256: f29de160910c773c471640be7125cf8ddb36148c9d1b52b5775f5f418e9fa361

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