Malicious PDF — malware analysis report

Static analysis result for SHA-256 784ccc8f8269724a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 03:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29eb21ac611dc6167ec400c862257f30 SHA-1: 2dca936cda2b4f69428e6eae148f9fbdd1dc620f SHA-256: 784ccc8f8269724ae39a19fecc451efb9a5547482c4502fb1c9458b188361150
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://12shio1.com/contents/files/31431732037.pdf In PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/73875299053.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8jile9brlj6jocuc8vf2l0brhl/bapibozarezutusevitome.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/ragegu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc4312767f---84875915913.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4b49815e---kamokazilokedeguf.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/8976814277.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/visisujebufadoli.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/bekokir.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812a7c9ef26---xotebavetogumujoru.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb0860fee---zosujugowexiwanogofoki.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871ac2b5300---23515776431.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085d97f38557---zebesikaja.pdfIn PDF document text
    • https://designclarf.it/file/49928329016.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0dbbcdb87---tujelomirobivimuj.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/lajozodunebekawovuv.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c5a2953af---jadivofixugi.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/9165b45789ce22a4f47212e093978a8c/bobevigebesezis.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/guf7cuj6pc7cps15jcf5l5cqnv/19026623780.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/merajunirumoxizim.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/83783494352.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/kirej.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/22772318765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=maupassant+short+stories+pdfPDF 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_off0000d7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C0 16736 bytes
SHA-256: c81b456037645568370fb4f98036e391cbcfb5ab550a307a19f87bea4fc47cef
font_01_sfnt_off0001030d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 10644 bytes
SHA-256: 1bf7a99242411f4857bca6df6fc34c88a645c0379ed790d10d7fb15db6695294

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