Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebbd8d5c082b5a5…

MALICIOUS

PDF

79.7 KB Created: 2021-09-23 09:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f0c37f17dfb2df88003aff5b9e190d3 SHA-1: 469e75e1750d5811363a6e7ed7f035d3996aaa31 SHA-256: cebbd8d5c082b5a519cfdf78101d37af708f46ae4d86aa642b29317cc78f718f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://catamma.ru/uplcv?utm_term=dr+who+harriet+jones PDF link annotation
    • http://wooshin.kr/uploaded/file/81257246661343700a079d.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fb046c504---voxolipeva.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/87265269377.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/ragibozijikolizefir.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/68057200357.pdfIn PDF document text
    • https://codecs.ro/images/file/92034859928.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/xokokoferob.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/fd1f9e54e6b30901049b0017529e7295/fumakakopozemudumajonof.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/469795.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/64655637171.pdfIn PDF document text
    • http://air-con.ru/upload/files/27317801133.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/87320229725.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/zexudevima.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16146da40f0094---35052045755.pdfIn PDF document text
    • http://idcla.net/upload/files/sunimizatimuzubozewu.pdfIn PDF document text
    • https://tuinvandecruys.be/file/52878764825.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/xupigedugodujunot.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/98544456951.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/93831909301.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/99840769287.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140255604979---62678890483.pdfIn PDF document text
    • http://atomleasing.ru/media/File/derovol.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/54617601898.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_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 10376 bytes
SHA-256: af0fdb376bbd93e64f10018f0a1d893dcc415ea3b217c74431450a7ae866ab6d
font_01_sfnt_off0000ec1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1E 17660 bytes
SHA-256: 400e38d21f1f28de10fda942339cd0a1a9fd8f3dc1ac718a401e8294447319c5
font_02_sfnt_off000119d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1