Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1225a95ac0aa12b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 03:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1173860c4827d77f0f562077a2f251a1 SHA-1: 2ad7eca45fffe6e588bf4396d161829470c151a6 SHA-256: a1225a95ac0aa12be73b68af39a4c9d84afe737e50514448040095ec4e8a22e6
156 Risk Score

Malware Insights

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

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, with numerous URLs pointing to external resources, some hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xinyuemu.net/assets/202107/files/20210702040850701509.pdf In PDF document text
    • http://efuturesthai.com/uploads/files/jexabeg.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sumamokagolato.pdfIn PDF document text
    • https://mackbeks.com/files/file/witadoduwa.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/nenunufife.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/00l7f65jcke89c7ch33rv9he42/bikuxixovitulos.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa90197157---97075799515.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4e7bdbdc0d15d7165465a0aeecd4a299/16362480736.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/fipeponafubixa.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/91469573589.pdfIn PDF document text
    • http://texmet.pl/userimages/file/nabumiwekuvusi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e399403e5---11519949297.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9478e9615c---pidadarikubow.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202108202111544073.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/furuxeboniti.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/2eda75b926521bc7b869d2ac2f6e9880/18617181423.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/miliporezode.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/f659b204c2986f983b583a87c827d6d4/buxapot.pdfIn PDF document text
    • https://cubic.is/userfiles/file/pixik.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/97452490348.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/41e670ca08f7e64f275f7d892b54183a/jakuzanidaginudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=probability+math+tutorial+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_off0000d056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 18232 bytes
SHA-256: bb2166b69b1ff7f55b4aaf76a63be0ae51f2ce0e74cd0362db17c27b99d712d2
font_01_sfnt_off000100bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BD 10712 bytes
SHA-256: 2401d45bc8e08442141daef65dc4cbf9fd4953901041076e20d3b2aebc395533
font_02_sfnt_off00011911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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