Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ecb854ac065573…

MALICIOUS

PDF

116.9 KB Created: 2021-09-06 07:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3053e9bde819f2338f3a0d74bca50af0 SHA-1: b141cab5eeafc0e62365af9569e21707d19ecb74 SHA-256: 06ecb854ac065573eaa3405e9e58671f0f189792860a1c9b5111bda14663bb07
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f9769a270f1282f7aa34e0d481760ec8/busuguzoxibozo.pdf In PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/51445148962.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607375c388fcf---livuwixibedave.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d2ae0e76397fc3aeb1e9e006e215b4f8/70611288825.pdfIn PDF document text
    • http://pribatu.lamilagrosaimport.com/images/files/12164059238.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48f614800d---lenotipekajupufebapixo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/556e4fd2b4e92d19557dd4efd94027aa/43496458249.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/suzilado.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/liter.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/pufokesigudame.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/bitorarowaxuxebu.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb48454e287---80865643063.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/lidunibude.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf12377ac3c---fanodenajozavamimidone.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee78e401fe---piginijemimidi.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/jibimabijepusavepodawo.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfjrfgglhn3rjq9349ga0u2tnu/gozadamejosamijixezakawo.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/1105098640.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ae77d7befff---49923138911.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/sataku.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/27471494380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=effective+c%2B%2B+book+pdfPDF 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_off0001619c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619C 10316 bytes
SHA-256: 66ed47204c1b09d0e32896e9dec616926f697633cd9b853aae6196799bc3bdc4
font_01_sfnt_off000178c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178C3 20344 bytes
SHA-256: dfc64531758f903d73fc39954e694cbe9f2229de0593c85eb30a2a9d9bc866f0
font_02_sfnt_off0001adda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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