Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa37ab6883269e4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 06:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef1f237d1e7b89c7d0b66120e9161865 SHA-1: 1b72b9d43852e46dd1cc9c24c376b1036fcf81d9 SHA-256: 9fa37ab6883269e420ebf90673311732e3c1d5c7e345d16d74ab9a39d3423fea
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://easyreturn.store/userfiles/file/vekawofeloxokimugodirot.pdf In PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/ditibabuguzotido.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/84286806807.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/be7b7968caecbe5c51105dd2db864f95/vaburoragimafagubolabebe.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134256e056b3---49043565659.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/rezesulofedaluzijosem.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/wufozaj.pdfIn PDF document text
    • http://synhbio.com/upload/files/jolotevokalijogodizulewi.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/18987139939.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/10022404960.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/98916492048.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/rifenuj.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/bafiwemitemifijozidi.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/34185449131.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210909193320_2072193673.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/gigoboji.pdfIn PDF document text
    • http://tasfor.com/files/galeria/files/49016240510.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/7155319452.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3371e5d19---gisus.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f05f55eb1f---74350686671.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/kemosedagixusibedeleser.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/99377201347.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/73203991857.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/41260438094.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/lububusabevirofikopelab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=bed+wars+play+free+onlinePDF 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_off0000d40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 17616 bytes
SHA-256: 7aff010f61ae91fc8fd1449776e6d3a1efd80ef7b94b0ed662e8356e317b1b86
font_02_sfnt_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 10648 bytes
SHA-256: f844df1fed3192eb3dd270eb80e7f40c790dc055ae22ec906262731b19027d62