Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ce91008fe366e1…

MALICIOUS

PDF

91.1 KB Created: 2021-09-06 01:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 72116773bc961c90b1a34c3715d6b2f9 SHA-1: 495cc550bc89a76d53ab91d0bc9380b288a25609 SHA-256: b6ce91008fe366e14a12d964023dd91442ccbd68b6fc109764f0b24a408fa2d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b17ae9c31---42922364433.pdf In PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/96330586024.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021062605374073499.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8ef16e6534a986efd893338427ff5154/mugifotefuberu.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/45262622081.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7312c88d6---65256449169.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/87274712547.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/14469015099.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4200416d0---roravedufimanepojipigop.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/fovoxiviwawabup.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac0c96c6da---tanuzijosivetakimaguvaf.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/pezefanubasozod.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/06de367f5cebdd21d282e8b9d635467a/12354687696.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e047fdc6c5b---22539473196.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/ropefab.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/71029572953.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/pefoke.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/59029880931.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/077b5ef9ff9f90eca3a89ecd2109dc7e/dukujasel.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/11eb5257d4f30ab7488e985c30a6ba9d/6045945273.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b619da24b4d---nufoxe.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/38807053524.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/51491587645.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d554cf8a2d016e002f6595e324d744e6/27643813539.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/7rkoh68fbblt39nor18qpcdqfd/pezuguwin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=biografi+alfred+adler+pdfPDF 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_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 10356 bytes
SHA-256: b1ccd7b247d05c8419978fc92fdeee5859aebdee76bc25e4e95b68578ed3527e
font_01_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001281e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281E 21304 bytes
SHA-256: 12db0f2fa226d666aa40f740b4e3827c543c01b8d529edd45e4a461907b9f738

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