Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a179b5ed383aee…

MALICIOUS

PDF

81.8 KB Created: 2021-08-14 20:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 330034024b7ec3529d8f367b6988e396 SHA-1: be9a82ca63fcd04c1bcf62c1c09d7c92b0203c8a SHA-256: 11a179b5ed383aeede77e5bed21893972c7eda828c2375d1eb10ee096b74fdc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised WordPress sites, which in turn host other PDF files. This behavior is indicative of a link farm used to distribute phishing content or further malware. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=winchester+gun+safe+lock+reset PDF link annotation
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14827a0fb---73472749353.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/xanazomekipa.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99d8cd49d7---manibedisobebizaletiro.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/61184295196.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7b26c787a---88831554323.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ab5f22ff98c2482c2a5df6483afa38ac/34962693985.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/0abrj0h1ag8p86al2qi8bggmr4/kifafiwoweredalamuzuban.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edec848b47---22050057490.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9c39f0cec---43587137006.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d0d7e49d8---losetifozadezujuferodu.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efbd619205---46796804904.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/78271667066.pdfIn PDF document text
    • https://latework.cz/soubory/kowewifovobon.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c20028da6c7---tegizosupanefuniwidolelu.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/madifavusobatijeju.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/13767488695.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/0jtrcu4cumgfcldueqigvlfa4m/towuwuxokoderefi.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/jemawazipepuzepaposelexo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa4c4d8f3---29413673354.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/modasojafonolufuwevama.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083358edbe40---62436447183.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/61971020817.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/pasasiribuxe.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_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 10800 bytes
SHA-256: ab32a6c17e5ef9d5ca326e2a0e116a73eacfea83f95f0a1159438c595b759139
font_01_sfnt_off0000f25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 18752 bytes
SHA-256: 2e113ba52e046ace8f05c04859859b074d631c891ce8a2b2894b09582c5e09f1
font_02_sfnt_off000121e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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