Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bcdeaee6197c18…

MALICIOUS

PDF

75.1 KB Created: 2021-09-13 00:27:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: deef63d9c9ef61e8cd1b46823c34e1e8 SHA-1: 2c86ccc04efd288137eaa3be5f3eaef09214c2cd SHA-256: 18bcdeaee6197c18a662737dcd4bab7aba5d5efc60d988e5f4f15c6231ea1b55
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified the file as malicious, specifically as a phishing trojan. The presence of numerous links suggests an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://riph.pl/userfiles/file/62217714234.pdf In PDF document text
    • http://futimisdev.com/userfiles/file/kukabujigubaxinuneti.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161355e5388ac8---86312635184.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42016008023.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c09f4dc9a---rogawowup.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/nododo.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/nifizotovatudafomedutorog.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/78530501160.pdfIn PDF document text
    • http://scantech3d.com/files/75232653181.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/81295556901.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/35da4587d6e058b047941e17aa125ea1/zobabevosuzive.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/79365634621.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/1894687344.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/pobivapirof.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nunevinefaruxuvevepa.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/tivelevesigawaxutubov.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/puxenogiguje.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324a6f77942---25422791928.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8cmahd42vrfro5l5uhjftmsof7/poloruboxozu.pdfIn PDF document text
    • http://2013.letnifestiwal.pl/ckfinder/userfiles/files/dudijetubinusabapujewov.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/pegagokakisek.pdfIn PDF document text
    • http://cleanenergy.mn/uploads/files/lamodij.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/64422767984.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/43633097727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dbz+shin+budokai+2+romPDF 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_off0000bd14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD14 10748 bytes
SHA-256: ffb62c36061a0d02df10dfbb514423d87b3f7d824a48afd6f6c1d4477f8af834
font_01_sfnt_off0000d59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59C 19040 bytes
SHA-256: 5425bce960115be15e32f66cd982f0af7b945e742477d58eec3f94edd03f9389
font_02_sfnt_off0001074d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1