Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce6742c4c504f30…

MALICIOUS

PDF

88.4 KB Created: 2021-08-15 21:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: beb0676a9b4665adbdde38cea484fcef SHA-1: e44946c9dbf26cf6eb9d32fad62bee22bec3b071 SHA-256: 5ce6742c4c504f30247692fb5d1b3e627a7144b6269b139eff1888017a52a07a
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ms-beauty.com/ckfinder/userfiles/files/bigume.pdf In PDF document text
    • http://nickels.design/ckfinder/userfiles/files/83914208540.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/27e0e329042319840e35f99b1296a732/47726381666.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/zepuzibenoxe.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/22825303348.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0c869e73---15005310141.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/50435947505.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c6b6ac47d3331b13e053e195cdb316dc/74355808437.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160aed18f556f9---konosobodev.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/24422726775.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607426d7637f7---fenivikopebolijujabuw.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee4ff50fee---76734921210.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/11c11c4919ffb12a55b1766e3e820c74/sewituxusoro.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d80f4bf94cd286f311b8b22c5a02e08b/nozezasi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610790cbeecce---lorejuboguj.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/411a0be63a9d3e0974e541ac3423147c/48192699927.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85368643928.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e1261578a41---39141249420.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b75eaa1d450925abfc7e026dcff8adb8/dezuz.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/sd2tu3oh18duj946khi29vkj0g/zizofa.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/b5f77a50cd6b962f14a1498b5369cab5/74478810989.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a20788eb16f---58328786003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=como+utilizar+la+maquina+de+coser+electricaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 1732 bytes
SHA-256: 5b3c947262022625ef2d4cfb2d0fa10a94f23c97611fd4c7364bfcc62a76ce6a
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 17656 bytes
SHA-256: f76afe5ec61b62db0198b0e132de4a561cbe2019b97fb915e1c8bf21c43b5fc1
font_02_sfnt_off00012037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001384e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384E 10868 bytes
SHA-256: 447d316bccb763d82c8f54c8fc2f261a2e8e3c45c5883872c84b13db3a7f9a3f

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