Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c1aef8e5c2f718…

MALICIOUS

PDF

78.4 KB Created: 2021-09-04 00:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 733f32ff9651be2a5738a84a03e959f6 SHA-1: 9211482d3db4aafb7afb7b44dddfa6de097d1354 SHA-256: 66c1aef8e5c2f7181873f016242b905c0e6550ab1454a14213bf0172f643d3f2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=carrier+30gb+chiller+manual+pdf PDF link annotation
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7fcd33d45d0d0fa88d997e4e5860c60b/xumakabupasozif.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910de5bf133---bopikafadupefamomod.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/dovidilitu.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/nozelewamofifiwezumomom.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/68087541366.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/58296887032.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e92efe1ed0---zesogojoxepuzemewo.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/16529919021.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/japovig.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/dogonabe.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/15421127122.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841bef85fc5---dazosegovelusobu.pdfIn PDF document text
    • http://geotersrl.it/file/goteputimo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de90f9ebbbc---dupirifejubekokis.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ed9d3b6b---gizegilazo.pdfIn PDF document text
    • https://servicepapik.ro/files/54724680086.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/m9gq4a316qn07jke7jqi29nlfgsqeq38/64626121820.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210829_DE9B5E3BEC1B59DE.pdfIn PDF document text
    • https://yasacompany.com/upload/files/88313926144.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/takela.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/81897110657.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/9de95aa52afad1dd94b20573c971fcec/tojawakejuzopu.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f052e2d2df17b0298c91c97deeedd163/97209197498.pdfIn PDF document text
    • http://fullx.net/files/18567075331.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/43449525695.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_off0000cfa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA6 16216 bytes
SHA-256: 18bf9b16774f67cda8f35f72539252cd8f5c85a9aea764d1f49bd6ae303450ec
font_01_sfnt_off0000f96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11183 11248 bytes
SHA-256: e236f99193d6da98d9def088cf39bce001dc9be91f71dc252687bc2b57c7f659