Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c5c88fb67900b8…

MALICIOUS

PDF

88.2 KB Created: 2021-09-05 15:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c56fa84b18fdf002efda1a30b710b9e SHA-1: 5c2450e271a360dd863797129da56b5cba34de18 SHA-256: 92c5c88fb67900b89b4ffb33e8307fc57f2b3a87440dea7ef7f46920cbb302fe
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files, many hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure suggests it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://isabellepieman.com/userfiles/file/36373135602.pdf In PDF document text
    • http://tscyw.net/userfiles/file/20210701154952_wsa2ix.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/96870866224.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b01c53d48---ramofupozubafekozef.pdfIn PDF document text
    • https://maturana.cl/upload/file/37302071289.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/eda050666478f4133903ac289f485035/21734122938.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/83611965256.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/buwotojipobazevotidut.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160772ca35730c---27731419663.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/miwazodupaxu.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/27942378912.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31cd12823e---2815851838.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a46ed99901f---21734224043.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/selemewurobepobebir.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/56606905820.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/34984402378.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/46873475920.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/zukes.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/79894620825.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/35442657188.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/59b5077a10477efdec0f764db40ef507/56820807271.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098ef842cbc1---retepopizinuvelajiso.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/11299999852.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/wizibalilizepeduger.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=clarinet+concerto+copland+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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 10476 bytes
SHA-256: db200f75850caa430f5bb776b085066db9b978b31d583f17b082b7599616e8c9
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 19784 bytes
SHA-256: e2311e34d5d4d8b5b6d71562b45ac0dfac150e5305974ae88a65a38823f43a17
font_02_sfnt_off00013b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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