Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe5cd3343fdd22d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-28 13:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11630b9d5d6d4faf675d35d489afa65f SHA-1: 8c5f5ffb07d0ed22c5e3ef904cb94ab3fd23af1f SHA-256: 9fe5cd3343fdd22d720d4fe3f068ad039c36403c2c3e51b54a66e3ca223d30dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to direct users to external, potentially malicious, content. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=tema+alien+para+android
    • http://silarperu.com/UserFiles/file/zozubu.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147df12ed087---70742591569.pdf
    • https://padservhosting.com/userfiles/file/xulofudafanozipuvuruzuru.pdf
    • http://www.polni.si/Images/files/vatukumuzedudowe.pdf
    • http://nepodoshlo.kz/ckfinder/userfiles/files/tobegakoxitari.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16149f2907eaac---lidulololokapubumepege.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/pisazijotezuribewovoka.pdf
    • http://etkindenetim.com/resimler/files/37961659567.pdf
    • http://eros-arena.com/eros/userfiles/file/92516901252.pdf
    • https://greenfuturevietnam.com/Upload/files/49684891720.pdf
    • https://cnc-ar.ro/files/file/pexabewobezag.pdf
    • http://e-kva.ru/admin/ckfinder/userfiles/files/sejarepunu.pdf
    • https://yaofangpeixun.com/upload/files/23593119280.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/25940360468.pdf
    • http://abwferrellpkwy.com/uploads/files/kopurigilipijepom.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/re9peaaa11irej3vacdobqhg2i/devopemesukovumaxanesomik.pdf
    • http://plan.msu.ac.th/ckfinder/userfiles/files/xebojutadagumugof.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614e6b9135875---bozefafekaneve.pdf
    • https://eclearusa.com/images/file/13914332423.pdf
    • http://vibrobreaker.com/files/files/17549062183.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ob0v1bdnvhprlr7b200oda8ke8/xedukizadon.pdf
    • http://geotersrl.it/file/34875871020.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/1cgbshu0dn3t7ece4pkh9cgd78/wuzomijejo.pdf
    • http://web5gstore.com/Files/files/dapiregikam.pdf
    • http://bluekeydigital.com/images/pic/file/85439203569.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2be.bin
17445e29fcc6f82ebef6a7b0314be089a63094b80fd236e45d949e56993b1d2a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BE 18684 bytes
font_01_sfnt_off0000e238.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 16792 bytes
font_02_sfnt_off0000fa4f.bin
c30abe368b3e5afb63f902a3b2b4f5bf24f1a4fa76fe7aabaab97ce71e2b36bd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4F 10248 bytes