Malicious PDF — malware analysis report

Static analysis result for SHA-256 c72bcbb375881987…

MALICIOUS

PDF

78.9 KB Created: 2021-07-05 18:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d65ba048f026a1d9cad8ddfc4fb0bced SHA-1: 88941de11122daca30dacd213ae73095bcdf15d4 SHA-256: c72bcbb3758819871e69fe49d46e6f85d4b1c41a4b006b13a322a8c21261cbd8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/0246941dcc46c7e08576354570a933dc/bewexefa.pdf In PDF document text
    • https://coastalstudio.com/images/main/file/sezoduvobesomowebikof.pdfIn PDF document text
    • http://princeverma.in/uploads/files/mutomajibedekiw.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/58889663762.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/12757604924.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8guf8uiudq27oej6mr4b7pgub0/fukapakefejijovedaregak.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/58154590338.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c669d43e4fd---ketasenapixosej.pdfIn PDF document text
    • https://sbufficio.it/file/sukuken.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/jozuvokubutuzamakifow.pdfIn PDF document text
    • https://landbar.com/upload/files/78889990684.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1cf74317---bezatupewapupavepa.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1bbe64ff7---podetiwosugu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082246cda888---58825834537.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b85ff3bd6e---18772919139.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/2c8cd8dc9134d3bef984a6bd57a63bef/27187358360.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160747a2010aa7---72481574160.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/tefogemipiv.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf54080949---voperoxafilalet.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/v1sndi4hamterclpn0q55m8fd7/dovupirekafojovifo.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/pulagefazaxelujunifamovor.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc9dd2c758---56435856864.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/40355320675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=blue+water+shrimp+and+seafoodPDF 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_off0000ce8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8E 11000 bytes
SHA-256: 0be4d2ce2dfd0404594a85033ec74d55c59dc7398635ff4fbd59714e6015238a
font_01_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 17644 bytes
SHA-256: e384d8df47e909976ace37b51137c69a1a16c76fceadaee3e29b22c1cbd4651e
font_02_sfnt_off00011648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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