Malicious PDF — malware analysis report

Static analysis result for SHA-256 54be77e5a84f27a0…

MALICIOUS

PDF

80.3 KB Created: 2021-08-17 09:16:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c5d401c76211fcecca6f3ff98e53001 SHA-1: 3ffdf63c8cb401fb64fef5ce81e2682b93f17594 SHA-256: 54be77e5a84f27a0240190a2c347f63b30b23c9a1bb163aad47b2cb6e706f573
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the structure of the PDF suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=exercice+de+plaque+de+charge+pour+caces PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5bcade77a.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a2b2cd21e---2302340597.pdfIn PDF document text
    • https://hongmao.tw/uploads//files/202108081344148262.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/sabibekidasisijukunofal.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/uavg3kv4r48uksok58j6vm18k2/40286310152.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/58141948318.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/pemuxeduze.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/nefan.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc6dcf3dda---29356567393.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e72f1d6024e0d213a396cf30d3506449/293685727.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/45234327920.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/gopapanoxezititivojop.pdfIn PDF document text
    • https://cowik.pl/upload/88278958379.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/dolabodojudirovejes.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/9556729116.pdfIn PDF document text
    • http://fedoro.ru/upload/file/towapunot.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/bexenizesozuk.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c457e655ebe---95012276034.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c9768e8e9---30525820335.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/ruzulomatatolasebusulaz.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/fitspfpdlc5j4aglpvek7r7cq4/14193574923.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d8f955a3a147b2640f2fa05be71489c/danixure.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_off0000d370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD370 10924 bytes
SHA-256: 3cf3a0e63658b2e001d12d702ae735f3a026e82e3ff4e22e69b9f56af503fcc9
font_01_sfnt_off0000ec47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC47 18432 bytes
SHA-256: 3e827705ed63a3986a910a6ad9ee846145ed75da2ef6a550cf9ca9bf47e7191f
font_02_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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