Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05f7a4cc54cabd3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-04 16:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bb3c60a1eccea89596fe7ccc109031ab SHA-1: 8ca718af1ea203023cfa6bcf838c4337597f9240 SHA-256: b05f7a4cc54cabd34cf473a1067c1b7f26aa6539f12fec25965dde7eeefaf70c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://planet-pvc.com/upload/files/9377027348.pdf In PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/99548366550.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e6f30e2fe83891139cee84eaee94e621/pazofapujuretekamoxave.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/pqinsruak97kdpbrjd98ht52qb/20967326327.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/50025459050.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/2gqro0mbrrpsip1r73ue4aeula/73864589885.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/siraxinuxododanarakanume.pdfIn PDF document text
    • http://standdominica.org/files/files/43817036736.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608379ef1318b---xawemutuxe.pdfIn PDF document text
    • https://tmtteks.com/files/81405059282.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1359008954d6f48b3d43136f8e410abd/16435045209.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b415227f863---somavefuluranakut.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/xozimepomabogowefifabexi.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210623004404181584829.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77e48b3e1---nujorerovijuwara.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/b7n14b4lt5jr13v10hgji36soi/jigekomefadej.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/kamesugedafod.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c1b8e1408---12292413940.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/mojevogolebejetidalevax.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1573eef64---27599636951.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/bojoxir.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/jojufiwaxezekogede.pdfIn PDF document text
    • http://houselandia.ru/files/24245480041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tanzania+occupational+health+and+safety+act+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34cf51908---4688593033.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_off0000d7c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C2 16436 bytes
SHA-256: 9693937bb9d362e24df4a72a4e05d24c6bc007acf439ed9d66310bf8e98d1919
font_01_sfnt_off00010247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 10852 bytes
SHA-256: f377b95e2c199d22b199f260b5a36cd1f85ab78319c727e92563327e563574af