Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7beb8f0af91eb0a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-09 08:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8acd3b398cfd15203849364b10302c6a SHA-1: 38ddf839929538dcb52a081a4ded8659f1e57f7e SHA-256: d7beb8f0af91eb0ac5265c4f2efc01a0f2cf99c08df966019674bcc4062a3d95
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' firings strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=words+that+begins+with+letter+u PDF link annotation
    • http://cristal-in.fr/userfiles/file/xipuxuriladolu.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/99627004864.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/xiput.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bovurotuwugibozedaxidimi.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/keludotanotupel.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/42608714885.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135fabc6b4a4---puneto.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/6d95eb7871be18d1fbb2fe6683ef04a4/91973636933.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/5cadf16d30fb60a7bec8ca108ce366b5/fuxefojovodek.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16133acc8808bc---devovibejajese.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/rolenog.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/10083923181.pdfIn PDF document text
    • http://konberdbio.com/upload/files/pubexorif.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109080849537950.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/7afa7b562f7c260891cbd083b2e0f0f0/wekijub.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/zoxukifabuditiz.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/bipopekuwiwig.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/35962034179.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/gulofonur.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/wemivitos.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/kebor.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/54587298950.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_off0000d3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D3 10848 bytes
SHA-256: a51fbcfdf45bc03e64fa509c75472c45b66b3c6dd0322cebca74daff94a2cac4
font_01_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B7 18292 bytes
SHA-256: ecefbc40c1cca3cc57233d232326a3f8a926a24b5608f770ae3b789b6208338a

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