Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d951e9e3c8f3b3d…

MALICIOUS

PDF

89.1 KB Created: 2021-09-03 11:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffe567628739642f7b14709e4174b8df SHA-1: a5d7bd23a8007cd7db98edbe4f63eb2924a09b7a SHA-256: 4d951e9e3c8f3b3d2e118a5efe26d1dcd9345f41fe9fe4f95a03805927298b7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDFs hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the heuristic firings suggest the PDF is designed as a link farm to facilitate malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://giasudaihocsupham.com/Images_upload/files/wewevuzud.pdf In PDF document text
    • https://foodvellythailand.com/upload/files/88373148126.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/razamuwuwakozu.pdfIn PDF document text
    • https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/50269024573.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/64841812171.pdfIn PDF document text
    • https://irantruck.ir/data/file/tatugetuxelelosanabufo.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e0c4541f7532035f4c0cf8f6973a02cd/69229252248.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021081304495073499.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/fakumedafekiz.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e627ebe2---nabefepivamuzipekovi.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46d46b803---38175122949.pdfIn PDF document text
    • http://tcihk.com/userfiles/zedixakurodefaro.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/60982355566.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97427e512---jipidavomolumulezugudovo.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078e497d804d---kodubasuzev.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/44174971670.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f25ef20a37---1645103596.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611daa665db38---66368508198.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b10185ac932---4692792914.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/76178180500.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/wifosetirokewadud.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/72803522480.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b98bf9e552---88214110799.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d4a96160a375267170d67544f5e85556/kumovapunasugigexez.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/82107523939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=topical+grammar+practice+4+pdf+downloadPDF 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_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 10920 bytes
SHA-256: e75c3a9ef541a402ce9329f11d36f372e6a29ff47096749cce53dbdb07cc99fc
font_01_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 19052 bytes
SHA-256: ee50c24e8dcc6c10f30815408d20af2c29226b2dc3c6f35e203aacd2910843bc
font_02_sfnt_off00013cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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