Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b8f9f15e2dd92c…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 09:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a012649f2366e8439ccd100a338f89a SHA-1: 2df7d50efafe7a76033cc4f941116c02411af907 SHA-256: a7b8f9f15e2dd92c57f812971b91827f775da74a504e5a85930c24f98a963882
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=hepatitis+diet+plan+pdf', suggest a phishing or content-luring attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=hepatitis+diet+plan+pdf PDF link annotation
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b41f736659588eb1ef851f280ba23aa6/92696546971.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/95042433582.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/52730541508.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1d37e6804660574b896b34e0b8efa0da/batiruzuj.pdfIn PDF document text
    • https://dafelia.com/files/kojesulixafoveked.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/butijafebopikeko.pdfIn PDF document text
    • http://mariancozma.com/_user/file/vobanudetusegozenuxujem.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/litufisigixavisofu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16118a62d1d58d---zadobejelewovulevoxip.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/50654353265.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609275761676d---85298650785.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/xeruperawedufikoxu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c9ac721234fef5715cfdd77893e7079/98868869086.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69145984571.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/tuwek.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/xelizajabavapa.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/sarijeduk.pdfIn PDF document text
    • https://eklyps.net/images/file/12103127667.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/f3462e52dcd1d771ba02120b7ad30cb5/loratirakopafuvix.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a630a8dd0---44186417808.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/62610b5fb63a2bd25fe6444515d19edb/82287506717.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/8aa2482e66133ef3b6290d2de179ccc6/94556198845.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/lesikujemesubufolo.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/larizofet.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_off0000dc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC52 16220 bytes
SHA-256: 84eebaea204eddafc70e7ea66c0170619dd4f411213166144a74c14b6fce167f
font_01_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 10260 bytes
SHA-256: 3b51459dfd7cdae5eca2ea78bece3bb519b6a2abf0a1a1c1459d75823461c807

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