Malicious PDF — malware analysis report

Static analysis result for SHA-256 151043b893c87ab1…

MALICIOUS

PDF

94.1 KB Created: 2021-06-27 07:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4ec4519fc3e46be5657ad9e5ee17ddc2 SHA-1: 2b825cecd5f77daa6145df234b5a790998f611f3 SHA-256: 151043b893c87ab16f3eeaf395e468c5ce0c1ebb38a24093640d3f3281910429
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://anhbanglaw.com/userfiles/file/libax.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/3905622526.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e359e3a78---57162185144.pdf
    • https://tlproduct.com/userfiles/file/nikukunutukexadokif.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ipibfkcldqlos88assev5inchm/mutuxesusevexisi.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a698992904d---puzanezirixobezizaguragu.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e047b7c4e7---javitojojuwitowilita.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608120fe7dcd6---jebew.pdf
    • https://bmat.mn/uploads/ckfinder/files/wufalobotetadirutugob.pdf
    • https://sayurhijau.com/contents//files/romobigutikikimono.pdf
    • http://lhs60to70.com/clients/3/32/32806278e47d7e4d905c37b1d6ebf04a/File/lafadoxesazadulekisutoveb.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bca76ce264a---zafavobojagafiv.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/6327b8c579d2c3872fdb07500ad64479/47711127372.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607f86d39ba2e---76218106010.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r3aau6kgabequmif83j48eb92v/lopavawuwifowibulaw.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a4374f1676e---53209871959.pdf
    • http://kurdumovldpr.ru/uploads/files/89196722220.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabac61559---fonip.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ad1babc78---76937218949.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970a153169f---poxitusilovonasoxize.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f479171e93---89182229023.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/92c7f2b4d3efe575d780d9fa6fe0466f/ferinerefaxegilifam.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8ecd378be---kukedufak.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b01dda9f984---javuxubefipuwexumoz.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jddl851lrdk59and72u3jt00l1/belatagaxeronamubevusux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=golgi+body+discovered+by
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f688.bin
39cfff7771cb3900eb6484439d1dabd17bf42e92df5d073908ef6374fe1a7e5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 17440 bytes
font_01_sfnt_off0001232d.bin
11cb706b2ee88132b8fb2cc8e252cb26bb879e968ffd6101d868e93e478205f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 10540 bytes
font_02_sfnt_off00013b1a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1A 16792 bytes
font_03_sfnt_off0001532b.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1532B 16252 bytes

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