Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b60776f30cead7…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 00:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 05ffdedbbe770bdaacc338fcba1d7efc SHA-1: 8a5e14c663f54cb0f9f8042057f60d1b488ec147 SHA-256: 51b60776f30cead787c83c386adedc2759afb277461cc9cdedc723815959a08d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=slab+definition+in+construction+pdf PDF link annotation
    • http://brukbet.com/user_images/file/98218815039.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acab528de8b---79353060141.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dbd7267de---82286742528.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1efec2951---zimudojebilososilu.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021050308115373499.pdfIn PDF document text
    • http://mcutech.net/files/7002180200.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/90066781693.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/gerogesudidebanuj.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d18d41a336bba904bb0f67e17e674dae/19839025296.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/7300923592.pdfIn PDF document text
    • https://lasanisports.com/files/guxotot.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/2c44d790042009f3457bfff5bf46a035/23931890426.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/226c3b921734a2cb1d2b042dc445d8e8/24272309066.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/19633212958.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/45197086263.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160946598ab388---dazegimivi.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d8277658766205157908869ed58e0f55/pejevafesudij.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/wetizif.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/79468183120.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/kanefuzulezumitubenag.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160882f0ccea9b---85133984891.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/disojo.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160906c4e13f4a---susuluzizujulipugadab.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_off0000bb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB87 10928 bytes
SHA-256: dd70f255c8d148e53131c5026441078d68dd649919903afc497faf13579c12a0
font_01_sfnt_off0000d4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AB 16708 bytes
SHA-256: cc5928fe94a91e234dc3a1c9b8324e150c8809a2d603c76bf8d0d445d8b7a3d3
font_02_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.