Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e5048ce18b87fc…

MALICIOUS

PDF

82.6 KB Created: 2021-08-26 00:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8b887d9c10382cff87b77146247dd9e5 SHA-1: 428678d664999a8018d872d2ae0fc9c52112dfb9 SHA-256: e9e5048ce18b87fc9a7c1d03263f4e19964b64aff8e1de84b659a20a77ffe8a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lead the user away from the document for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://ajur.rest/uploads/userfiles/file/sumijuloxoj.pdf In PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6ajdukkel8fpdt5r6tdlmqmqmt/78746655717.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/tifotimuj.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/806bc39516415294d54721b5699e47f7/kolujisunejikabukibutek.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/50le03pk618p23cmkg1bm7dinl/wujabiwibeveka.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d15f5fb24---74992511506.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/tuxagilogolaxolefedeni.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/vumimezuligufop.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/n3is7875viqappg9a2rm0s4oss/xuvotinu.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/84282471315.pdfIn PDF document text
    • http://teraval.cz/res/file/bukekefuzegikekewetipok.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/lasajesavim.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/f895823fd0446997271d3928be2abe2e/tufinisedimezutifubinas.pdfIn PDF document text
    • http://kodcomputers.ro/2664/uploads/wasodubasotukaruvenegite.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/dutufopesimat.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/lidegizezefiso.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/miradujakutije.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f0fc4cbeb---xutevorusulipo.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/38272d85af37d513d230647fd06b816d/xugibavode.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160739d542bdd9---gujozisusozuzadunotegoba.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf2281cd7b---44427441497.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/93255623647.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/cebd0a36e3c3fb4a4d79086ed2bf1d22/wiluwarulalidirirusukos.pdfIn PDF document text
    • http://alhs1973.com/clients/64426/File/pumezopefalijepew.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/defomipumepuledize.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/jafakapovemukoxemukuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=funniest+roblox+id+songsPDF 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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 16700 bytes
SHA-256: b79cfea00b0cbdae62921b70cc478aea0fcf08e6d0ab7a2b900ae88592e6804b
font_01_sfnt_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12413 10580 bytes
SHA-256: e084eeca5d780f77efc40107bd2ffdddbd7db764e46111643d32d9015f86470a