Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84578a3d4aa220a…

MALICIOUS

PDF

91.0 KB Created: 2021-06-27 10:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3d8d2068e0579eb480397d808547a4d3 SHA-1: 183f7929cb9e8f2162c8e6e10f3defdb971ee3b9 SHA-256: d84578a3d4aa220a4175b5a18ff0fb6220ac16447ea2c9fbfe0f05ae890f6eef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://infrive.ru/uplcv?utm_term=two+storey+house+complete+plan+pdf PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf78134ee---zatapunekonekojogujiken.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/72174e59469a17ab830697d2a958c3b8/zovaparapenabaju.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/tozifizatewewetabukezu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/76533228983.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cb3837b1ca0201d58da0d5b23496d393/69620187167.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65947d1ec8---83093041214.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c305f86827e---xulimexijuruxivugituvewex.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/702880e522d69027c1f7ae8c4760f27d/47359612091.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/gemazasivipafavobev.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7edae16c0---11473485012.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/gadeden.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8fbe5611c046c996f15163bb56e300c7/67506705014.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b346100b7b6---43886876557.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ce2092765---60014193267.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c57089cfed9---tuzewel.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4279e05134---zobudenusulimojajujup.pdfIn PDF document text
    • https://quaint-house.com/30533928885.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/05d7a5d1bf8e4f729b37d4a8002ecf32/dopotajovunu.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/kebuvuve.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078031212005---74056748132.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/4c3b77bc5fe0044741875652a8bc7a17/tasire.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a24086486c9---63366797944.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ed06816fa6bfdda52d56eca671b04d94/3496605675.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/50973334822.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/vurux.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_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 11056 bytes
SHA-256: 10dd98237e0700212c6390a01a2d49531f2f3a6d8b07c372a4465d1825ff36f6
font_02_sfnt_off00013004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13004 17640 bytes
SHA-256: 3ee7ff60d9255e525e273b77d5a9e674f3f024cedb4eaf97e33f3d85db5fa131

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