Malicious PDF — malware analysis report

Static analysis result for SHA-256 da110bbcc74c9c29…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 15:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4583ee5bd6f64b76facd3dcf17d48508 SHA-1: 1cd8943d4dd77b549870f2d7e7b529ede1da1f83 SHA-256: da110bbcc74c9c29da09efb038122bf8ca8eaa6bbc3df5fe876bf8b692b075a2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://infrive.ru/uplcv?utm_term=bobby+v+anonymous PDF link annotation
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fh1r2t6kikanht4tv81v3befrm/nanobis.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/rapivi.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/11505714406.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/2tbt2gpdapgt1gokrbjejuj3nr/2492246190.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613419bfbcb0f---55380618068.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e88c20e8a---18487950051.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/42634193769.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/sositibivulol.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/27465435891.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161410fcbdce72---69926823172.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/86992383654.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/21930608922.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/27037705865.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/83060182287.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/32448999066.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/poxufem.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/zoregezibevo.pdfIn PDF document text
    • http://hitmet.slektenkaas.com/bilder/file/66915326141.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/58947898496.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/92791816700.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/30940013276.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210914051356.pdfIn PDF document text
    • http://otczenacts.com/media/files/gatefaxiwejigofuv.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/16962367692.pdfIn PDF document text
    • http://schokofontaenen.de/idata/nekunuti.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EA 17528 bytes
SHA-256: 463515f05d61af50c96cced08c2b76d1e288bd1dc2f8e9a7e2f08c52a6c583cd
font_01_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 1972 bytes
SHA-256: b5097d94ac6861a373fc00ebe3b869b74d996f6821ffb5232fc2e2fb2a1a3c7a
font_03_sfnt_off000111fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FE 10276 bytes
SHA-256: 12795511ae56545ffe1d9496444fa7469c85d927a87066803a3ed225313a0861

Open this report in the interactive analyzer, or submit your own file for analysis.